diff --git a/pcbnew/zones_by_polygon.cpp b/pcbnew/zones_by_polygon.cpp
index 3a242dbb65..0608b8df66 100644
--- a/pcbnew/zones_by_polygon.cpp
+++ b/pcbnew/zones_by_polygon.cpp
@@ -934,6 +934,7 @@ void PCB_EDIT_FRAME::Delete_Zone_Contour( wxDC* DC, ZONE_CONTAINER* aZone )
 
     else
     {
+        SaveCopyInUndoList( aZone, UR_CHANGED );
         aZone->m_Poly->RemoveContour( ncont );
     }