diff --git a/contrib/remote-helpers/test-hg.sh b/contrib/remote-helpers/test-hg.sh
index 62e3a473bd..6a1e4b1ad6 100755
--- a/contrib/remote-helpers/test-hg.sh
+++ b/contrib/remote-helpers/test-hg.sh
@@ -144,7 +144,8 @@ test_expect_success 'authors' '
   author_test zeta " test " "test <unknown>" &&
   author_test eta "test < test@example.com >" "test <test@example.com>" &&
   author_test theta "test >test@example.com>" "test <unknown>" &&
-  author_test iota "test < test <at> example <dot> com>" "test <unknown>"
+  author_test iota "test < test <at> example <dot> com>" "test <unknown>" &&
+  author_test kappa "test@example.com" "test@example.com <unknown>"
   ) &&
 
   git clone "hg::$PWD/hgrepo" gitrepo &&