diff --git a/src/st/st-viewport.c b/src/st/st-viewport.c
index 039eebf46..0eb1868ab 100644
--- a/src/st/st-viewport.c
+++ b/src/st/st-viewport.c
@@ -78,6 +78,7 @@ adjustment_value_notify_cb (StAdjustment *adjustment,
                             GParamSpec   *pspec,
                             StViewport   *viewport)
 {
+  clutter_actor_invalidate_transform (CLUTTER_ACTOR (viewport));
   clutter_actor_queue_relayout (CLUTTER_ACTOR (viewport));
 }