diff --git a/Documentation/op-guide/maintenance.md b/Documentation/op-guide/maintenance.md
index b513ba250..05c26bede 100644
--- a/Documentation/op-guide/maintenance.md
+++ b/Documentation/op-guide/maintenance.md
@@ -87,7 +87,7 @@ Removing excessive keyspace data and defragmenting the backend database will put
 
 ```sh
 # get current revision
-$ rev=$(ETCDCTL_API=3 etcdctl --endpoints=:2379 endpoint status --write-out="json" | egrep -o '"revision":[0-9]*' | egrep -o '[0-9]*')
+$ rev=$(ETCDCTL_API=3 etcdctl --endpoints=:2379 endpoint status --write-out="json" | egrep -o '"revision":[0-9]*' | egrep -o '[0-9].*')
 # compact away all old revisions
 $ ETCDCTL_API=3 etcdctl compact $rev
 compacted revision 1516