diff --git a/block/blkdebug.c b/block/blkdebug.c
index cd9eb80..45bbab8 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -316,8 +316,8 @@ static int blkdebug_open(BlockDriverState *bs, const char *filename, int flags)
 static void error_callback_bh(void *opaque)
 {
     struct BlkdebugAIOCB *acb = opaque;
-    qemu_bh_delete(acb->bh);
     acb->common.cb(acb->common.opaque, acb->ret);
+    qemu_bh_delete(acb->bh);
     qemu_aio_release(acb);
 }