diff --git a/block/blkverify.c b/block/blkverify.c
index e4a37af3b2..020b1ae7b6 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -258,7 +258,7 @@ blkverify_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
     return blkverify_co_prwv(bs, &r, offset, bytes, qiov, qiov, flags, true);
 }
 
-static int blkverify_co_flush(BlockDriverState *bs)
+static int coroutine_fn blkverify_co_flush(BlockDriverState *bs)
 {
     BDRVBlkverifyState *s = bs->opaque;