diff --git a/docs/reference/gtk/gtk.types b/docs/reference/gtk/gtk.types
index 89a6b48314..5d0289f8ab 100644
--- a/docs/reference/gtk/gtk.types
+++ b/docs/reference/gtk/gtk.types
@@ -1,3 +1,5 @@
+#include <gtk/gtk.h>
+
 gtk_about_dialog_get_type
 gtk_accel_group_get_type
 gtk_accel_label_get_type