diff --git a/common_arm64.h b/common_arm64.h
index 99e0cee57..314946282 100644
--- a/common_arm64.h
+++ b/common_arm64.h
@@ -35,7 +35,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #define MB   __asm__ __volatile__ ("dmb  ish" : : : "memory")
 #define WMB  __asm__ __volatile__ ("dmb  ishst" : : : "memory")
-
+#define RMB  __asm__ __volatile__ ("dmb  ishld" : : : "memory")
 
 #define INLINE inline