diff --git a/block.c b/block.c
index 5ec1a38..20d5ee0 100644
--- a/block.c
+++ b/block.c
@@ -680,7 +680,7 @@
 
     ret = 0;
 out:
-    blk_unref(blk);
+    blk_co_unref(blk);
     return ret;
 }