diff --git a/block/quorum.c b/block/quorum.c
index ff5a0a2..f28758c 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -825,8 +825,8 @@
     return result;
 }
 
-static bool quorum_recurse_can_replace(BlockDriverState *bs,
-                                       BlockDriverState *to_replace)
+static bool GRAPH_RDLOCK
+quorum_recurse_can_replace(BlockDriverState *bs, BlockDriverState *to_replace)
 {
     BDRVQuorumState *s = bs->opaque;
     int i;