diff --git a/common/plotters/HPGL_plotter.cpp b/common/plotters/HPGL_plotter.cpp
index 01e5db8855..7bf1d06bbf 100644
--- a/common/plotters/HPGL_plotter.cpp
+++ b/common/plotters/HPGL_plotter.cpp
@@ -907,7 +907,7 @@ void HPGL_PLOTTER::sortItems( std::list<HPGL_ITEM>& items )
     items.splice( items.begin(), target );
 }
 
-wxString HPGL_PLOTTER::lineTypeCommand( PLOT_DASH_TYPE linetype )
+const char* HPGL_PLOTTER::lineTypeCommand( PLOT_DASH_TYPE linetype )
 {
     switch( linetype )
     {
diff --git a/common/plotters/plotter_hpgl.h b/common/plotters/plotter_hpgl.h
index 1075028ecb..c288f89707 100644
--- a/common/plotters/plotter_hpgl.h
+++ b/common/plotters/plotter_hpgl.h
@@ -177,7 +177,7 @@ protected:
     static void sortItems( std::list<HPGL_ITEM>& items );
 
     /// Return the plot command corresponding to a line type
-    static wxString lineTypeCommand( PLOT_DASH_TYPE linetype );
+    static const char* lineTypeCommand( PLOT_DASH_TYPE linetype );
 
     std::list<HPGL_ITEM> m_items;
     HPGL_ITEM*           m_current_item;