diff --git a/include/wx/gdicmn.h b/include/wx/gdicmn.h
index 14b648b092..10baa55178 100644
--- a/include/wx/gdicmn.h
+++ b/include/wx/gdicmn.h
@@ -318,7 +318,7 @@ public:
     void DecBy(int d) { DecBy(d, d); }
 
 
-    wxSize& Scale(float xscale, float yscale)
+    wxSize& Scale(double xscale, double yscale)
         { x = (int)(x*xscale); y = (int)(y*yscale); return *this; }
 
     // accessors
diff --git a/interface/wx/gdicmn.h b/interface/wx/gdicmn.h
index 5d18c2aa7a..6e98d29d88 100644
--- a/interface/wx/gdicmn.h
+++ b/interface/wx/gdicmn.h
@@ -1014,7 +1014,7 @@ public:
         @return A reference to this object (so that you can concatenate other
                  operations in the same line).
     */
-    wxSize& Scale(float xscale, float yscale);
+    wxSize& Scale(double xscale, double yscale);
 
     /**
         Sets the width and height members.