--- a/mt76.h	2019-06-26 07:20:16.824670280 +0200
+++ b/mt76.h	2019-06-26 07:20:45.660340322 +0200
@@ -32,6 +32,10 @@
 #define MT_RX_BUF_SIZE      2048
 #define MT_SKB_HEAD_LEN     128
 
+#ifndef ACCESS_ONCE
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+#endif
+
 struct mt76_dev;
 struct mt76_wcid;