diff --git a/util/net_help.c b/util/net_help.c
index 1a94492e2..054fa5086 100644
--- a/util/net_help.c
+++ b/util/net_help.c
@@ -772,6 +772,8 @@ void ub_openssl_lock_delete(void)
 	int i;
 	if(!ub_openssl_locks)
 		return;
+	CRYPTO_set_id_callback(NULL);
+	CRYPTO_set_locking_callback(NULL);
 	for(i=0; i<CRYPTO_num_locks(); i++) {
 		lock_basic_destroy(&ub_openssl_locks[i]);
 	}