diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index 64c4cfdb61..2ea2e85160 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -6559,7 +6559,9 @@ gtk_text_view_move_cursor (GtkTextView     *text_view,
       
     case GTK_MOVEMENT_PAGES:
     case GTK_MOVEMENT_HORIZONTAL_PAGES:
+      /* We handle these cases above and return early from them. */
     default:
+      g_assert_not_reached ();
       break;
     }