diff --git a/pkg/receive/multitsdb.go b/pkg/receive/multitsdb.go
index 4ad1b15ed2..26e6284b73 100644
--- a/pkg/receive/multitsdb.go
+++ b/pkg/receive/multitsdb.go
@@ -587,10 +587,10 @@ func (t *MultiTSDB) TSDBLocalClients() []store.Client {
 
 	t.mtx.RUnlock()
 	t.mtx.Lock()
+	defer t.mtx.Unlock()
 	if !t.tsdbClientsNeedUpdate {
 		return t.tsdbClients
 	}
-	defer t.mtx.Unlock()
 
 	res := make([]store.Client, 0, len(t.tenants))
 	for _, tenant := range t.tenants {