diff --git a/qemu-barrier.h b/qemu-barrier.h
index 735eea6cf9..c11bb2b59f 100644
--- a/qemu-barrier.h
+++ b/qemu-barrier.h
@@ -14,7 +14,7 @@
  */
 #define smp_wmb()   barrier()
 
-#elif defined(__powerpc__)
+#elif defined(_ARCH_PPC)
 
 /*
  * We use an eieio() for a wmb() on powerpc.  This assumes we don't