diff --git a/src/os2/toplevel.cpp b/src/os2/toplevel.cpp
index 3f5d41eeba..252b601bd0 100644
--- a/src/os2/toplevel.cpp
+++ b/src/os2/toplevel.cpp
@@ -37,6 +37,7 @@
     #include "wx/frame.h"
     #include "wx/control.h"
     #include "wx/containr.h"        // wxSetFocusToChild()
+    #include "wx/module.h"        // wxSetFocusToChild()
 #endif //WX_PRECOMP
 
 #include "wx/os2/private.h"