diff --git a/src/gtk/nonownedwnd.cpp b/src/gtk/nonownedwnd.cpp
index 36f2dd9db0..dcc34a500b 100644
--- a/src/gtk/nonownedwnd.cpp
+++ b/src/gtk/nonownedwnd.cpp
@@ -27,6 +27,7 @@
     #include "wx/dcclient.h"
     #include "wx/dcmemory.h"
     #include "wx/region.h"
+    #include "wx/scopedptr.h"
 #endif // WX_PRECOMP
 
 #include "wx/graphics.h"