diff --git a/ext/mysqlnd/mysqlnd_vio.c b/ext/mysqlnd/mysqlnd_vio.c
index 7a9fa313922..67210f083a9 100644
--- a/ext/mysqlnd/mysqlnd_vio.c
+++ b/ext/mysqlnd/mysqlnd_vio.c
@@ -236,6 +236,7 @@ MYSQLND_METHOD(mysqlnd_vio, open_tcp_or_unix)(MYSQLND_VIO * const vio, const MYS
 		zend_resource *le;
 
 		if ((le = zend_hash_str_find_ptr(&EG(persistent_list), hashed_details, hashed_details_len))) {
+			ZEND_ASSERT(le->ptr == net_stream);
 			origin_dtor = EG(persistent_list).pDestructor;
 			/*
 			  in_free will let streams code skip destructing - big HACK,