diff --git a/include/hw/virtio/virtio_ring.h b/include/hw/virtio/virtio_ring.h
index 8f58bc975e..0b42e6eae5 100644
--- a/include/hw/virtio/virtio_ring.h
+++ b/include/hw/virtio/virtio_ring.h
@@ -139,8 +139,8 @@ static inline void vring_init(struct vring *vr, unsigned int num, void *p,
     vr->num = num;
     vr->desc = p;
     vr->avail = p + num*sizeof(struct vring_desc);
-    vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + sizeof(uint16_t)
-        + align-1) & ~(align - 1));
+    vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(uint16_t)
+        + align - 1) & ~(align - 1));
 }
 
 static inline unsigned vring_size(unsigned int num, unsigned long align)