diff --git a/utils/dialoged/src/winstyle.cpp b/utils/dialoged/src/winstyle.cpp
index 7d09211b5f..96bed4c5fe 100644
--- a/utils/dialoged/src/winstyle.cpp
+++ b/utils/dialoged/src/winstyle.cpp
@@ -26,6 +26,7 @@
 
 #include "wx/listctrl.h"
 #include "wx/treectrl.h"
+#include "wx/splitter.h"
 
 #include <ctype.h>
 #include <stdlib.h>