diff --git a/src/msw/treectrl.cpp b/src/msw/treectrl.cpp
index ff98a5db03..8171cae0a3 100644
--- a/src/msw/treectrl.cpp
+++ b/src/msw/treectrl.cpp
@@ -45,6 +45,7 @@
 #include "wx/dynarray.h"
 #include "wx/imaglist.h"
 #include "wx/treectrl.h"
+#include "wx/settings.h"
 
 #ifdef __GNUWIN32__
 #ifndef wxUSE_NORLANDER_HEADERS