diff --git a/include/wx/motif/button.h b/include/wx/motif/button.h
index 13fe4ecf90..c872066bb9 100644
--- a/include/wx/motif/button.h
+++ b/include/wx/motif/button.h
@@ -48,6 +48,8 @@ public:
     virtual void SetDefault();
     virtual void Command(wxCommandEvent& event);
 
+    static wxSize GetDefaultSize();
+    
     // Implementation
     virtual void ChangeFont(bool keepOriginalSize = TRUE);
     virtual void ChangeBackgroundColour();
diff --git a/src/motif/button.cpp b/src/motif/button.cpp
index ac7c31cfec..144cb92156 100644
--- a/src/motif/button.cpp
+++ b/src/motif/button.cpp
@@ -122,6 +122,14 @@ void wxButton::SetDefault()
     XtVaSetValues ((Widget) parent->GetMainWidget(), XmNdefaultButton, (Widget) GetMainWidget(), NULL);
 }
 
+/* static */
+wxSize wxButton::GetDefaultSize()
+{
+    // TODO: check font size as in wxMSW ?  MB
+    //
+    return wxSize(80,26);
+}
+
 void wxButton::Command (wxCommandEvent & event)
 {
     ProcessCommand (event);