diff --git a/manifests/system-upgrade/k3s-upgrade-v1.28.yaml b/manifests/system-upgrade/k3s-upgrade-v1.28.yaml
index 56402a9..f3255b9 100644
--- a/manifests/system-upgrade/k3s-upgrade-v1.28.yaml
+++ b/manifests/system-upgrade/k3s-upgrade-v1.28.yaml
@@ -19,7 +19,7 @@ spec:
   jobActiveDeadlineSecs: 3600
   cordon: true
   drain:
-    timeout: 900s # 15 minutes
+    timeout: 900 # 15 minutes
     force: true
     ignoreDaemonSets: true
     deleteLocalData: true