diff --git a/tests/test-merge-subrepos.t b/tests/test-merge-subrepos.t
--- a/tests/test-merge-subrepos.t
+++ b/tests/test-merge-subrepos.t
@@ -59,9 +59,18 @@
 
   $ hg id --config extensions.blackbox= --config blackbox.dirty=True
   9bfe45a197d7+ tip
+#if no-chg
   $ cat .hg/blackbox.log
   * @9bfe45a197d7b0ab09bf287729dd57e9619c9da5+ (*)> id (glob)
   * @9bfe45a197d7b0ab09bf287729dd57e9619c9da5+ (*)> id --config *extensions.blackbox=* --config *blackbox.dirty=True* exited 0 * (glob)
+#else
+The first line of blackbox.log will correspond to the chg master server.
+Therefore, glob first line when chg is running.
+  $ cat .hg/blackbox.log
+  * (glob)
+  * @9bfe45a197d7b0ab09bf287729dd57e9619c9da5+ (*)> id (glob)
+  * @9bfe45a197d7b0ab09bf287729dd57e9619c9da5+ (*)> id --config *extensions.blackbox=* --config *blackbox.dirty=True* exited 0 * (glob)
+#endif
 
 TODO: a deleted file should be listed as such, like the top level repo