diff --git a/src/unix/fontenum.cpp b/src/unix/fontenum.cpp
index 9c9dc5bc7c..f1181a4aa7 100644
--- a/src/unix/fontenum.cpp
+++ b/src/unix/fontenum.cpp
@@ -40,6 +40,7 @@
 #include "pango/pango.h"
 
 #ifdef __WXGTK20__
+#include "gtk/gtk.h"
 extern GtkWidget *wxGetRootWindow();
 #endif