diff --git a/common_ia64.h b/common_ia64.h
index 72b75fc4e..59aefbd6d 100644
--- a/common_ia64.h
+++ b/common_ia64.h
@@ -47,6 +47,7 @@
 
 #define MB
 #define WMB
+#define RMB
 
 #ifdef __ECC
 #include <ia64intrin.h>