diff --git a/sys/ia64/include/atomic.h b/sys/ia64/include/atomic.h
index fdfcb9ebaf3..d2f88748351 100644
--- a/sys/ia64/include/atomic.h
+++ b/sys/ia64/include/atomic.h
@@ -29,9 +29,9 @@
 #ifndef _MACHINE_ATOMIC_H_
 #define	_MACHINE_ATOMIC_H_
 
-#define	mb()
-#define	wmb()
-#define	rmb()
+#define	mb()	__asm __volatile("mf")
+#define	wmb()	mb()
+#define	rmb()	mb()
 
 /*
  * Various simple arithmetic on memory which is atomic in the presence