diff --git a/block/qcow.c b/block/qcow.c
index c8bfecc1cb..eba5a04c44 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -596,7 +596,7 @@ static int qcow_co_writev(BlockDriverState *bs, int64_t sector_num,
     if (qiov->niov > 1) {
         qemu_vfree(orig_buf);
     }
-    free(cluster_data);
+    g_free(cluster_data);
 
     return ret;
 }