diff --git a/xen-all.c b/xen-all.c
index 84420d8..1bc2c3c 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -620,7 +620,7 @@
             }
         }
     } else {
-        target_ulong tmp;
+        uint64_t tmp;
 
         if (req->dir == IOREQ_READ) {
             for (i = 0; i < req->count; i++) {