diff --git a/src/generic/dirctrlg.cpp b/src/generic/dirctrlg.cpp
index a41fdba627..8e0994cf03 100644
--- a/src/generic/dirctrlg.cpp
+++ b/src/generic/dirctrlg.cpp
@@ -93,6 +93,8 @@
     #include "dos.h"
 #endif
 
+extern WXDLLEXPORT_DATA(const wxChar) wxFileSelectorDefaultWildcardStr[];
+
 // If compiled under Windows, this macro can cause problems
 #ifdef GetFirstChild
 #undef GetFirstChild