diff --git a/src/common/filefn.cpp b/src/common/filefn.cpp
index 92ce4c1f64..cb035c4407 100644
--- a/src/common/filefn.cpp
+++ b/src/common/filefn.cpp
@@ -61,6 +61,7 @@
 
 #ifdef __WINDOWS__
     #include "wx/msw/private.h"
+    #include "wx/msw/missing.h"
     #include "wx/msw/mslu.h"
 
     // sys/cygwin.h is needed for cygwin_conv_to_full_win32_path()