diff --git a/src/slic3r/GUI/GUI_App.hpp b/src/slic3r/GUI/GUI_App.hpp
index 31ec24aacd..6d317676cf 100644
--- a/src/slic3r/GUI/GUI_App.hpp
+++ b/src/slic3r/GUI/GUI_App.hpp
@@ -284,6 +284,7 @@ public:
     void            OSXStoreOpenFiles(const wxArrayString &files) override;
     // wxWidgets override to get an event on open files.
     void            MacOpenFiles(const wxArrayString &fileNames) override;
+    void            MacOpenURL(const wxString& url) override;
 #endif /* __APPLE */
 
     Sidebar&             sidebar();