diff --git a/apps/app_queue.c b/apps/app_queue.c
index 9741b8715e..87c04f7ee1 100644
--- a/apps/app_queue.c
+++ b/apps/app_queue.c
@@ -475,11 +475,12 @@ enum queue_member_status {
 	QUEUE_NORMAL
 };
 
-static enum queue_member_status get_member_status(const struct call_queue *q, int max_penalty)
+static enum queue_member_status get_member_status(struct call_queue *q, int max_penalty)
 {
 	struct member *member;
 	enum queue_member_status result = QUEUE_NO_MEMBERS;
 
+	ast_mutex_lock(&q->lock);
 	for (member = q->members; member; member = member->next) {
 		if (max_penalty && (member->penalty > max_penalty))
 			continue;
@@ -494,10 +495,12 @@ static enum queue_member_status get_member_status(const struct call_queue *q, in
 			result = QUEUE_NO_REACHABLE_MEMBERS;
 			break;
 		default:
+			ast_mutex_unlock(&q->lock);
 			return QUEUE_NORMAL;
 		}
 	}
 	
+	ast_mutex_unlock(&q->lock);
 	return result;
 }