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-rw-r--r--include/hw/xen/io/ring.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/hw/xen/io/ring.h b/include/hw/xen/io/ring.h
index abbca47687..ffa3ebadc8 100644
--- a/include/hw/xen/io/ring.h
+++ b/include/hw/xen/io/ring.h
@@ -65,7 +65,7 @@ typedef unsigned int RING_IDX;
  */
 #define __CONST_RING_SIZE(_s, _sz) \
     (__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \
-	    sizeof(((struct _s##_sring *)0)->ring[0])))
+            sizeof_field(struct _s##_sring, ring[0])))
 /*
  * The same for passing in an actual pointer instead of a name tag.
  */