diff --git a/gtk/gtktexttag.c b/gtk/gtktexttag.c
index 1f20889b7e..cbc1a2f3f4 100644
--- a/gtk/gtktexttag.c
+++ b/gtk/gtktexttag.c
@@ -880,6 +880,9 @@ gtk_text_tag_class_init (GtkTextTagClass *klass)
                   G_TYPE_OBJECT,
                   GDK_TYPE_EVENT | G_SIGNAL_TYPE_STATIC_SCOPE,
                   GTK_TYPE_TEXT_ITER);
+  g_signal_set_va_marshaller (signals[EVENT],
+                              G_OBJECT_CLASS_TYPE (object_class),
+                              _gtk_marshal_BOOLEAN__OBJECT_BOXED_BOXEDv);
 }
 
 static void