diff --git a/compose-examples/docker/compose.yaml b/compose-examples/docker/compose.yaml
index 48eed2b..a22b21a 100644
--- a/compose-examples/docker/compose.yaml
+++ b/compose-examples/docker/compose.yaml
@@ -44,7 +44,7 @@ services:
       WATCHTOWER_CLEANUP: "true"
       WATCHTOWER_INCLUDE_STOPPED: "true"
       WATCHTOWER_POLL_INTERVAL: $WT_INTERVAL
-      WATCHTOWER_TIMEOUT: 15
+      WATCHTOWER_TIMEOUT: 15s
       WATCHTOWER_NOTIFICATIONS_LEVEL: info
       WATCHTOWER_HTTP_API_METRICS: "true"
       WATCHTOWER_HTTP_API_TOKEN: $WATCHTOWER_API_TOKEN