--- src/sys/dev/disk/sym/sym_hipd.c	2007/02/03 23:13:19	1.21
+++ src/sys/dev/disk/sym/sym_hipd.c	2007/09/23 04:09:55	1.22
@@ -149,7 +149,7 @@ typedef	u_int32_t u32;
  *  make sense) to be used.
  */
 
-#if	defined	__i386__
+#if	defined	__i386__ || defined __amd64__
 #define MEMORY_BARRIER()	do { ; } while(0)
 #elif	defined	__powerpc__
 #define MEMORY_BARRIER()	__asm__ volatile("eieio; sync" : : : "memory")