diff --git a/xen/include/xen/delay.h b/xen/include/xen/delay.h
index 9d70ef035f..9150226271 100644
--- a/xen/include/xen/delay.h
+++ b/xen/include/xen/delay.h
@@ -4,7 +4,11 @@
 /* Copyright (C) 1993 Linus Torvalds */
 
 #include <asm/delay.h>
-#define mdelay(n) (\
-	{unsigned long msec=(n); while (msec--) udelay(1000);})
+
+static inline void mdelay(unsigned long msec)
+{
+    while ( msec-- )
+        udelay(1000);
+}
 
 #endif /* defined(_LINUX_DELAY_H) */