diff --git a/contrib/python3-whitelist b/contrib/python3-whitelist
--- a/contrib/python3-whitelist
+++ b/contrib/python3-whitelist
@@ -185,6 +185,7 @@
 test-glog-topological.t
 test-gpg.t
 test-graft.t
+test-grep.t
 test-hg-parseurl.py
 test-hghave.t
 test-hgignore.t
diff --git a/tests/test-grep.t b/tests/test-grep.t
--- a/tests/test-grep.t
+++ b/tests/test-grep.t
@@ -18,7 +18,7 @@
 pattern error
 
   $ hg grep '**test**'
-  grep: invalid match pattern: nothing to repeat
+  grep: invalid match pattern: nothing to repeat* (glob)
   [1]
 
 simple