diff --git a/ui/vnc.c b/ui/vnc.c
index 548588aab8..06d6ca009e 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1878,6 +1878,7 @@ static void framebuffer_update_request(VncState *vs, int incremental,
         return;
     }
 
+    vs->force_update = 1;
     vnc_set_area_dirty(vs->dirty, width, height, x, y, w, h);
 }