diff --git a/cmd/metacache-set.go b/cmd/metacache-set.go
index 051c1b653..5924b3f6b 100644
--- a/cmd/metacache-set.go
+++ b/cmd/metacache-set.go
@@ -599,7 +599,7 @@ type metaCacheRPC struct {
 
 func (m *metaCacheRPC) setErr(err string) {
 	m.mu.Lock()
-	defer m.mu.Lock()
+	defer m.mu.Unlock()
 	meta := *m.meta
 	if meta.status != scanStateError {
 		meta.error = err