diff --git a/infrastructure/backup/base/cronjob.yaml b/infrastructure/backup/base/cronjob.yaml
index 524ec38..9a6cadb 100644
--- a/infrastructure/backup/base/cronjob.yaml
+++ b/infrastructure/backup/base/cronjob.yaml
@@ -21,7 +21,7 @@ spec:
             command: ["curl"]
             args:
               - "-H"
-              - "Title: $OPERATION"
+              - "Title: ${OPERATION}"
               - "-d"
               - "Finished successfully"
               - "https://ntfy.kluster.moll.re/backup"