diff --git a/image/overlay/usr/bin/image-updater b/image/overlay/usr/bin/image-updater
old mode 100644
new mode 100755
index ee6ea43..5ed4b9e
--- a/image/overlay/usr/bin/image-updater
+++ b/image/overlay/usr/bin/image-updater
@@ -1,6 +1,5 @@
 #!/bin/sh
 
-while true; do
-	docker pull git.sfclub.cc/cloud/workspace-image:latest
-	sleep 3600
+until docker pull git.sfclub.cc/cloud/workspace-image:latest >/dev/null 2>&1; do
+	sleep 3
 done