diff --git a/cluster/engine.go b/cluster/engine.go
index 891d641bbd..e04f6f7080 100644
--- a/cluster/engine.go
+++ b/cluster/engine.go
@@ -231,7 +231,7 @@ func (e *Engine) isConnected() bool {
 // IsHealthy returns true if the engine is healthy
 func (e *Engine) IsHealthy() bool {
 	e.RLock()
-	e.RUnlock()
+	defer e.RUnlock()
 	return e.state == stateHealthy
 }