diff --git a/lib/context.c b/lib/context.c
index f67476b1e..9f221f50f 100644
--- a/lib/context.c
+++ b/lib/context.c
@@ -1621,7 +1621,7 @@ lws_context_destroy2(struct lws_context *context)
 	lws_check_deferred_free(context, 1);
 
 #if LWS_MAX_SMP > 1
-	pthread_mutex_destroy(&context->lock, NULL);
+	pthread_mutex_destroy(&context->lock);
 #endif
 
 	lws_free(context);