diff --git a/src/gtk/glcanvas.cpp b/src/gtk/glcanvas.cpp
index cc6f93546f..98d32c753f 100644
--- a/src/gtk/glcanvas.cpp
+++ b/src/gtk/glcanvas.cpp
@@ -29,6 +29,7 @@ extern "C"
 }
 
 #include "wx/gtk/win_gtk.h"
+#include "wx/gtk/private.h"
 
 // DLL options compatibility check:
 #include "wx/build.h"