diff --git a/common_arm.h b/common_arm.h
index eb4234b05..4acbc7061 100644
--- a/common_arm.h
+++ b/common_arm.h
@@ -71,9 +71,18 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef COMMON_ARM
 #define COMMON_ARM
 
+#if defined(ARMV5) || defined(ARMV6)
+
+#define MB
+#define WMB
+
+#else
+
 #define MB   __asm__ __volatile__ ("dmb  ish" : : : "memory")
 #define WMB  __asm__ __volatile__ ("dmb  ishst" : : : "memory")
 
+#endif
+
 #define INLINE inline
 
 #define RETURN_BY_COMPLEX