diff --git a/data/common.yaml b/data/common.yaml
index 6d306cf..93e2bdb 100644
--- a/data/common.yaml
+++ b/data/common.yaml
@@ -78,7 +78,7 @@ profile_system_auth::kerberos::crons:
     monthday: 15
     user: "root"
   "key_refresh":
-    command: "sleep $((RANDOM \% 15))m && k5srvutil change >/tmp/k5srvutil_change.$$ 2>&1 || cat  /tmp/k5srvutil_change.$$ && rm -f /tmp/k5srvutil_change.$$"
+    command: "sleep $((RANDOM \u005C\u0025 15))m && k5srvutil change >/tmp/k5srvutil_change.$$ 2>&1 || cat  /tmp/k5srvutil_change.$$ && rm -f /tmp/k5srvutil_change.$$"
     environment:
       - "SHELL=/bin/sh"
     hour: 23