diff --git a/3d-viewer/3d_draw.cpp b/3d-viewer/3d_draw.cpp
index 0cda29ba35..422b4822f9 100644
--- a/3d-viewer/3d_draw.cpp
+++ b/3d-viewer/3d_draw.cpp
@@ -258,7 +258,7 @@ GLuint EDA_3D_CANVAS::CreateDrawGL_List()
             if( curr_zone->m_FillMode == 0 )
             {
                 // solid polygons only are used to fill areas
-                if( curr_zone->m_FilledPolysList.size() > 3 )
+                if( curr_zone->GetFilledPolysList().size() > 3 )
                 {
                     Draw3D_SolidPolygonsInZones( curr_zone );
                 }
@@ -286,14 +286,16 @@ GLuint EDA_3D_CANVAS::CreateDrawGL_List()
         {
             ZONE_CONTAINER* zone = pcb->GetArea( ii );
 
-            if( zone->m_FilledPolysList.size() == 0 )
+            std::vector<CPolyPt> polysList = zone->GetFilledPolysList();
+
+            if( polysList.size() == 0 )
                 continue;
 
             if( zone->m_ZoneMinThickness <= 1 )
                 continue;
 
-            int      imax = zone->m_FilledPolysList.size() - 1;
-            CPolyPt* firstcorner = &zone->m_FilledPolysList[0];
+            int      imax = polysList.size() - 1;
+            CPolyPt* firstcorner = &polysList[0];
             CPolyPt* begincorner = firstcorner;
             SEGZONE  dummysegment( pcb );
             dummysegment.SetLayer( zone->GetLayer() );
@@ -301,7 +303,7 @@ GLuint EDA_3D_CANVAS::CreateDrawGL_List()
 
             for( int ic = 1; ic <= imax; ic++ )
             {
-                CPolyPt* endcorner = &zone->m_FilledPolysList[ic];
+                CPolyPt* endcorner = &polysList[ic];
 
                 if( begincorner->utility == 0 )
                 {
@@ -330,7 +332,7 @@ GLuint EDA_3D_CANVAS::CreateDrawGL_List()
                     ic++;
 
                     if( ic < imax - 1 )
-                        begincorner = firstcorner = &zone->m_FilledPolysList[ic];
+                        begincorner = firstcorner = &polysList[ic];
                 }
                 else
                 {
@@ -440,7 +442,8 @@ void EDA_3D_CANVAS::Draw3D_SolidPolygonsInZones( ZONE_CONTAINER* aZone )
     // Draw solid areas contained in this zone
     int StartContour = 1;
 
-    for( unsigned ii = 0; ii < aZone->m_FilledPolysList.size(); ii++ )
+    std::vector<CPolyPt> polysList = aZone->GetFilledPolysList();
+    for( unsigned ii = 0; ii < polysList.size(); ii++ )
     {
         if( StartContour == 1 )
         {
@@ -449,11 +452,11 @@ void EDA_3D_CANVAS::Draw3D_SolidPolygonsInZones( ZONE_CONTAINER* aZone )
             StartContour = 0;
         }
 
-        v_data[0] = aZone->m_FilledPolysList[ii].x * g_Parm_3D_Visu.m_BoardScale;
-        v_data[1] = -aZone->m_FilledPolysList[ii].y * g_Parm_3D_Visu.m_BoardScale;
-        gluTessVertex( tess, v_data, &aZone->m_FilledPolysList[ii] );
+        v_data[0] = polysList[ii].x * g_Parm_3D_Visu.m_BoardScale;
+        v_data[1] = -polysList[ii].y * g_Parm_3D_Visu.m_BoardScale;
+        gluTessVertex( tess, v_data, &polysList[ii] );
 
-        if( aZone->m_FilledPolysList[ii].end_contour == 1 )
+        if( polysList[ii].end_contour == 1 )
         {
             gluTessEndContour( tess );
             gluTessEndPolygon( tess );
diff --git a/pcbnew/class_zone.h b/pcbnew/class_zone.h
index 1b80fc8173..8c81c296f9 100644
--- a/pcbnew/class_zone.h
+++ b/pcbnew/class_zone.h
@@ -457,6 +457,34 @@ public:
      */
     bool IsSame( const ZONE_CONTAINER &aZoneToCompare );
 
+   /**
+     * Function ClearFilledPolysList
+     * clears the list of filled polygons.
+     */
+    void ClearFilledPolysList()
+    {
+        m_FilledPolysList.clear();
+    }
+
+   /**
+     * Function GetFilledPolysList
+     * returns a reference to the list of filled polygons.
+     * @return Reference to the list of filled polygons.
+     */
+    const std::vector<CPolyPt>& GetFilledPolysList() const
+    {
+        return m_FilledPolysList;
+    }
+
+   /**
+     * Function AddFilledPolysList
+     * sets the list of filled polygons.
+     */
+    void AddFilledPolysList( std::vector<CPolyPt>& aPolysList )
+    {
+        m_FilledPolysList = aPolysList;
+    }
+
     /**
      * Function GetSmoothedPoly
      * returns a pointer to the corner-smoothed version of
@@ -522,16 +550,6 @@ public:
     // true when a zone was filled, false after deleting the filled areas
     bool                  m_IsFilled;
 
-    /* set of filled polygons used to draw a zone as a filled area.
-     * from outlines (m_Poly) but unlike m_Poly these filled polygons have no hole
-     * (they are* all in one piece)  In very simple cases m_FilledPolysList is same
-     * as m_Poly.  In less simple cases (when m_Poly has holes) m_FilledPolysList is
-     * a polygon equivalent to m_Poly, without holes but with extra outline segment
-     * connecting "holes" with external main outline.  In complex cases an outline
-     * described by m_Poly can have many filled areas
-     */
-    std::vector <CPolyPt> m_FilledPolysList;
-
     /* set of segments used to fill area, when fill zone by segment is used.
      *  ( m_FillMode == 1 )
      *  in this case segments have m_ZoneMinThickness width
@@ -549,6 +567,16 @@ private:
     // if priorities are equal, a DRC error is set
     unsigned              m_priority;
     ZoneConnection        m_PadConnection;
+
+    /* set of filled polygons used to draw a zone as a filled area.
+     * from outlines (m_Poly) but unlike m_Poly these filled polygons have no hole
+     * (they are* all in one piece)  In very simple cases m_FilledPolysList is same
+     * as m_Poly.  In less simple cases (when m_Poly has holes) m_FilledPolysList is
+     * a polygon equivalent to m_Poly, without holes but with extra outline segment
+     * connecting "holes" with external main outline.  In complex cases an outline
+     * described by m_Poly can have many filled areas
+     */
+    std::vector <CPolyPt> m_FilledPolysList;
 };
 
 
diff --git a/pcbnew/edit.cpp b/pcbnew/edit.cpp
index fe488532cd..4f1bd33441 100644
--- a/pcbnew/edit.cpp
+++ b/pcbnew/edit.cpp
@@ -579,7 +579,7 @@ void PCB_EDIT_FRAME::Process_Special_Functions( wxCommandEvent& event )
         {
             // Remove filled areas in zone
             ZONE_CONTAINER* zone_container = GetBoard()->GetArea( ii );
-            zone_container->m_FilledPolysList.clear();
+            zone_container->ClearFilledPolysList();
         }
 
         SetCurItem( NULL );        // CurItem might be deleted by this command, clear the pointer
diff --git a/pcbnew/kicad_plugin.cpp b/pcbnew/kicad_plugin.cpp
index cbae672f75..0303c807a0 100644
--- a/pcbnew/kicad_plugin.cpp
+++ b/pcbnew/kicad_plugin.cpp
@@ -970,7 +970,7 @@ void PCB_IO::format( ZONE_CONTAINER* aZone, OUTPUTFORMATTER* aFormatter, int aNe
     }
 
     // Save the PolysList
-    const std::vector< CPolyPt >& fv = aZone->m_FilledPolysList;
+    const std::vector< CPolyPt >& fv = aZone->GetFilledPolysList();
 
     if( fv.size() )
     {
diff --git a/pcbnew/legacy_plugin.cpp b/pcbnew/legacy_plugin.cpp
index bf0c374fb2..a1636740ee 100644
--- a/pcbnew/legacy_plugin.cpp
+++ b/pcbnew/legacy_plugin.cpp
@@ -2258,6 +2258,7 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
         else if( TESTLINE( "$POLYSCORNERS" ) )
         {
             // Read the PolysList (polygons used for fill areas in the zone)
+            std::vector<CPolyPt> polysList;
 
             while( READLINE( m_reader ) )
             {
@@ -2273,8 +2274,9 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
                 bool    end_contour = intParse( data, &data );  // end_countour was a bool when file saved, so '0' or '1' here
                 int     utility     = intParse( data );
 
-                zc->m_FilledPolysList.push_back( CPolyPt( x, y, end_contour, utility ) );
+               polysList.push_back( CPolyPt( x, y, end_contour, utility ) );
             }
+            zc->AddFilledPolysList( polysList );
         }
 
         else if( TESTLINE( "$FILLSEGMENTS" ) )
@@ -3569,7 +3571,7 @@ void LEGACY_PLUGIN::saveZONE_CONTAINER( const ZONE_CONTAINER* me ) const
     }
 
     // Save the PolysList
-    const CPOLY_PTS& fv = me->m_FilledPolysList;
+    const CPOLY_PTS& fv = me->GetFilledPolysList();
     if( fv.size() )
     {
         fprintf( m_fp, "$POLYSCORNERS\n" );
diff --git a/pcbnew/onrightclick.cpp b/pcbnew/onrightclick.cpp
index 0548b4061e..d33c08b470 100644
--- a/pcbnew/onrightclick.cpp
+++ b/pcbnew/onrightclick.cpp
@@ -631,7 +631,7 @@ void PCB_EDIT_FRAME::createPopUpMenuForZones( ZONE_CONTAINER* edge_zone, wxMenu*
         AddMenuItem( zones_menu, ID_POPUP_PCB_FILL_ZONE, _( "Fill Zone" ),
                      KiBitmap( fill_zone_xpm ) );
 
-        if( edge_zone->m_FilledPolysList.size() > 0 )
+        if( edge_zone->GetFilledPolysList().size() > 0 )
         {
             AddMenuItem( zones_menu, ID_POPUP_PCB_REMOVE_FILLED_AREAS_IN_CURRENT_ZONE,
                          _( "Remove Filled Areas in Zone" ), KiBitmap( zone_unfill_xpm ) );
diff --git a/pcbnew/plot_rtn.cpp b/pcbnew/plot_rtn.cpp
index 2a431c719f..0617152f06 100644
--- a/pcbnew/plot_rtn.cpp
+++ b/pcbnew/plot_rtn.cpp
@@ -523,7 +523,8 @@ void PlotTextePcb( PLOTTER* aPlotter, const PCB_PLOT_PARAMS& aPlotOpts, TEXTE_PC
  */
 void PlotFilledAreas( PLOTTER* aPlotter, const PCB_PLOT_PARAMS& aPlotOpts, ZONE_CONTAINER* aZone, EDA_DRAW_MODE_T trace_mode )
 {
-    unsigned        imax = aZone->m_FilledPolysList.size();
+    std::vector<CPolyPt> polysList = aZone->GetFilledPolysList();
+    unsigned imax = polysList.size();
 
     if( imax == 0 )  // Nothing to draw
         return;
@@ -540,7 +541,7 @@ void PlotFilledAreas( PLOTTER* aPlotter, const PCB_PLOT_PARAMS& aPlotOpts, ZONE_
      */
     for( unsigned ic = 0; ic < imax; ic++ )
     {
-        CPolyPt* corner = &aZone->m_FilledPolysList[ic];
+        CPolyPt* corner = &polysList[ic];
         cornerList.push_back( wxPoint( corner->x, corner->y) );
 
         if( corner->end_contour )   // Plot the current filled area outline
diff --git a/pcbnew/zones_by_polygon_fill_functions.cpp b/pcbnew/zones_by_polygon_fill_functions.cpp
index 2705b44831..88126a0c4a 100644
--- a/pcbnew/zones_by_polygon_fill_functions.cpp
+++ b/pcbnew/zones_by_polygon_fill_functions.cpp
@@ -105,7 +105,7 @@ int PCB_EDIT_FRAME::Fill_Zone( ZONE_CONTAINER* aZone )
 
     wxBusyCursor dummy;     // Shows an hourglass cursor (removed by its destructor)
 
-    aZone->m_FilledPolysList.clear();
+    aZone->ClearFilledPolysList();
     aZone->UnFill();
     aZone->BuildFilledPolysListData( GetBoard() );
 
diff --git a/pcbnew/zones_convert_brd_items_to_polygons_with_Boost.cpp b/pcbnew/zones_convert_brd_items_to_polygons_with_Boost.cpp
index 24a34ad036..f844b5a6a4 100644
--- a/pcbnew/zones_convert_brd_items_to_polygons_with_Boost.cpp
+++ b/pcbnew/zones_convert_brd_items_to_polygons_with_Boost.cpp
@@ -471,6 +471,7 @@ int CopyPolygonsFromKPolygonListToFilledPolysList( ZONE_CONTAINER* aZone,
                                                    KPolygonSet&    aKPolyList )
 {
     int count = 0;
+    std::vector<CPolyPt> polysList;
 
     for( unsigned ii = 0; ii < aKPolyList.size(); ii++ )
     {
@@ -487,14 +488,15 @@ int CopyPolygonsFromKPolygonListToFilledPolysList( ZONE_CONTAINER* aZone,
             // Flag this corner if starting a hole connection segment:
             // This is used by draw functions to draw only useful segments (and not extra segments)
             // corner.utility = (aBoolengine->GetPolygonPointEdgeType() == KB_FALSE_EDGE) ? 1 : 0;
-            aZone->m_FilledPolysList.push_back( corner );
+            polysList.push_back( corner );
             count++;
         }
 
         corner.end_contour = true;
-        aZone->m_FilledPolysList.pop_back();
-        aZone->m_FilledPolysList.push_back( corner );
+        polysList.pop_back();
+        polysList.push_back( corner );
     }
+    aZone->AddFilledPolysList( polysList );
 
     return count;
 }
@@ -503,7 +505,8 @@ int CopyPolygonsFromKPolygonListToFilledPolysList( ZONE_CONTAINER* aZone,
 int CopyPolygonsFromFilledPolysListTotKPolygonList( ZONE_CONTAINER* aZone,
                                                     KPolygonSet&    aKPolyList )
 {
-    unsigned corners_count = aZone->m_FilledPolysList.size();
+    std::vector<CPolyPt> polysList = aZone->GetFilledPolysList();
+    unsigned corners_count = polysList.size();
     int      count = 0;
     unsigned ic    = 0;
 
@@ -511,7 +514,7 @@ int CopyPolygonsFromFilledPolysListTotKPolygonList( ZONE_CONTAINER* aZone,
 
     for( unsigned ii = 0; ii < corners_count; ii++ )
     {
-        CPolyPt* corner = &aZone->m_FilledPolysList[ic];
+        CPolyPt* corner = &polysList[ic];
 
         if( corner->end_contour )
             polycount++;
@@ -527,7 +530,7 @@ int CopyPolygonsFromFilledPolysListTotKPolygonList( ZONE_CONTAINER* aZone,
         {
             for( ; ic < corners_count; ic++ )
             {
-                CPolyPt* corner = &aZone->m_FilledPolysList[ic];
+                CPolyPt* corner = &polysList[ic];
                 cornerslist.push_back( KPolyPoint( corner->x, corner->y ) );
                 count++;
 
diff --git a/pcbnew/zones_polygons_test_connections.cpp b/pcbnew/zones_polygons_test_connections.cpp
index 6762202bd4..91b4695717 100644
--- a/pcbnew/zones_polygons_test_connections.cpp
+++ b/pcbnew/zones_polygons_test_connections.cpp
@@ -28,7 +28,7 @@ void Merge_SubNets_Connected_By_CopperAreas( BOARD* aPcb, int aNetcode );
 bool sort_areas( const ZONE_CONTAINER* ref, const ZONE_CONTAINER* tst )
 {
     if( ref->GetNet() == tst->GetNet() )
-        return ref->m_FilledPolysList.size() < tst->m_FilledPolysList.size();
+        return ref->GetFilledPolysList().size() < tst->GetFilledPolysList().size();
     else
         return ref->GetNet() < tst->GetNet();
 }
@@ -71,7 +71,7 @@ void BOARD::Test_Connections_To_Copper_Areas( int aNetcode )
             continue;
         if( (aNetcode >= 0) && ( aNetcode != curr_zone->GetNet() ) )
             continue;
-        if( curr_zone->m_FilledPolysList.size() == 0 )
+        if( curr_zone->GetFilledPolysList().size() == 0 )
             continue;
         zones_candidates.push_back(curr_zone);
     }
@@ -120,10 +120,11 @@ void BOARD::Test_Connections_To_Copper_Areas( int aNetcode )
 
         // test if a candidate is inside a filled area of this zone
         unsigned indexstart = 0, indexend;
-        for( indexend = 0; indexend < curr_zone->m_FilledPolysList.size(); indexend++ )
+        std::vector<CPolyPt> polysList = curr_zone->GetFilledPolysList();
+        for( indexend = 0; indexend < polysList.size(); indexend++ )
         {
             // end of a filled sub-area found
-            if( curr_zone->m_FilledPolysList[indexend].end_contour )
+            if( polysList[indexend].end_contour )
             {
                 subnet++;
                 EDA_RECT bbox = curr_zone->CalculateSubAreaBoundaryBox( indexstart, indexend );
@@ -162,7 +163,7 @@ void BOARD::Test_Connections_To_Copper_Areas( int aNetcode )
 
                     if( bbox.Contains( pos1 ) )
                     {
-                        if( TestPointInsidePolygon( curr_zone->m_FilledPolysList, indexstart,
+                        if( TestPointInsidePolygon( polysList, indexstart,
                                                     indexend, pos1.x, pos1.y ) )
                             connected = true;
                     }
@@ -170,7 +171,7 @@ void BOARD::Test_Connections_To_Copper_Areas( int aNetcode )
                     {
                         if( bbox.Contains( pos2 ) )
                         {
-                            if( TestPointInsidePolygon( curr_zone->m_FilledPolysList,
+                            if( TestPointInsidePolygon( polysList,
                                                         indexstart, indexend,
                                                         pos2.x, pos2.y ) )
                                 connected = true;