diff --git a/gtk/gtkbbox.c b/gtk/gtkbbox.c
index 6ff894b759..245fa3c006 100644
--- a/gtk/gtkbbox.c
+++ b/gtk/gtkbbox.c
@@ -26,6 +26,8 @@
 
 #include "config.h"
 #include "gtkbbox.h"
+#include "gtkhbbox.h"
+#include "gtkvbbox.h"
 #include "gtkorientable.h"
 #include "gtkprivate.h"
 #include "gtkintl.h"