diff --git a/include/wx/gtk/icon.h b/include/wx/gtk/icon.h
index 7bcfd636c2..22c1bda7e5 100644
--- a/include/wx/gtk/icon.h
+++ b/include/wx/gtk/icon.h
@@ -41,7 +41,7 @@ public:
   inline wxIcon(const wxIcon& icon) { Ref(icon); }
   inline wxIcon(const wxIcon* icon) { if (icon) Ref(*icon); }
 
-  wxIcon( char **bits, int WXUNUSED(width), int WXUNUSED(height) ) :
+  wxIcon( char **bits, int width=-1, int height=-1 ) :
     wxBitmap( bits ) {};
     
   inline wxIcon& operator = (const wxIcon& icon) { if (*this == icon) return (*this); Ref(icon); return *this; }
diff --git a/include/wx/gtk1/icon.h b/include/wx/gtk1/icon.h
index 7bcfd636c2..22c1bda7e5 100644
--- a/include/wx/gtk1/icon.h
+++ b/include/wx/gtk1/icon.h
@@ -41,7 +41,7 @@ public:
   inline wxIcon(const wxIcon& icon) { Ref(icon); }
   inline wxIcon(const wxIcon* icon) { if (icon) Ref(*icon); }
 
-  wxIcon( char **bits, int WXUNUSED(width), int WXUNUSED(height) ) :
+  wxIcon( char **bits, int width=-1, int height=-1 ) :
     wxBitmap( bits ) {};
     
   inline wxIcon& operator = (const wxIcon& icon) { if (*this == icon) return (*this); Ref(icon); return *this; }