diff --git a/queue.go b/queue.go
index e1da4a1..d5b448a 100644
--- a/queue.go
+++ b/queue.go
@@ -253,7 +253,7 @@ func (h *httpWriter) Flush() {
 
 func (q *Queue) GetListeners() (listeners []*ListenerInformation) {
 	q.mutex.RLock()
-	defer q.mutex.Unlock()
+	defer q.mutex.RUnlock()
 
 	listeners = make([]*ListenerInformation, 0, 1)