diff --git a/mvcc/watchable_store.go b/mvcc/watchable_store.go
index 0529993c6..4d709d644 100644
--- a/mvcc/watchable_store.go
+++ b/mvcc/watchable_store.go
@@ -358,9 +358,9 @@ func (s *watchableStore) syncWatchers() int {
 	tx := s.store.b.ReadTx()
 	tx.RLock()
 	revs, vs := tx.UnsafeRange(keyBucketName, minBytes, maxBytes, 0)
+	tx.RUnlock()
 	var evs []mvccpb.Event
 	evs = kvsToEvents(s.store.lg, wg, revs, vs)
-	tx.RUnlock()
 
 	var victims watcherBatch
 	wb := newWatcherBatch(wg, evs)