diff --git a/src/gtk/gdiobj.cpp b/src/gtk/gdiobj.cpp
index 7627a2739f..1bd836eef3 100644
--- a/src/gtk/gdiobj.cpp
+++ b/src/gtk/gdiobj.cpp
@@ -7,6 +7,7 @@
 // Licence:   	wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+#include "wx/defs.h"
 #include "wx/gdiobj.h"
 
 IMPLEMENT_DYNAMIC_CLASS(wxGDIObject, wxObject)
diff --git a/src/gtk1/gdiobj.cpp b/src/gtk1/gdiobj.cpp
index 7627a2739f..1bd836eef3 100644
--- a/src/gtk1/gdiobj.cpp
+++ b/src/gtk1/gdiobj.cpp
@@ -7,6 +7,7 @@
 // Licence:   	wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+#include "wx/defs.h"
 #include "wx/gdiobj.h"
 
 IMPLEMENT_DYNAMIC_CLASS(wxGDIObject, wxObject)