diff --git a/include/wx/osx/cocoa/private.h b/include/wx/osx/cocoa/private.h
index 507816b182..c9cea5f018 100644
--- a/include/wx/osx/cocoa/private.h
+++ b/include/wx/osx/cocoa/private.h
@@ -266,7 +266,7 @@ protected :
 
     @end 
     
-    void wxOSXCocoaClassAddWXMethods(Class c);
+    void WXDLLIMPEXP_CORE wxOSXCocoaClassAddWXMethods(Class c);
 
 #endif // __OBJC__