diff --git a/block.c b/block.c
index 8800a6b5b37215f8c264676dce5857e2d206a8b4..c9629a44b99c8adf0de3c58e879c73118e8559f8 100644
--- a/block.c
+++ b/block.c
@@ -4040,7 +4040,7 @@ int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num,
     if (ret < 0) {
         return ret;
     }
-    return (ret & BDRV_BLOCK_ALLOCATED);
+    return !!(ret & BDRV_BLOCK_ALLOCATED);
 }
 
 /*