diff --git a/include/wx/msw/private.h b/include/wx/msw/private.h
index 883ad9932c..d76b3ae85a 100644
--- a/include/wx/msw/private.h
+++ b/include/wx/msw/private.h
@@ -736,7 +736,7 @@ enum wxWinVersion
     wxWinVersion_NT6 = 0x0600
 };
 
-extern wxWinVersion wxGetWinVersion();
+WXDLLEXPORT wxWinVersion wxGetWinVersion();
 
 #if wxUSE_GUI