diff --git a/pkgs/servers/mail/public-inbox/default.nix b/pkgs/servers/mail/public-inbox/default.nix
index 0e44e315637..2a6e1637a68 100644
--- a/pkgs/servers/mail/public-inbox/default.nix
+++ b/pkgs/servers/mail/public-inbox/default.nix
@@ -35,6 +35,11 @@ let
     # perl5.32.0-public-inbox> #   at t/eml.t line 272.
     # perl5.32.0-public-inbox> Wide character in print at /nix/store/38vxlxrvg3yji3jms44qn94lxdysbj5j-perl-5.32.0/lib/perl5/5.32.0/Test2/Formatter/TAP.pm line 125.
     "eml"
+    # Failed test 'Makefile OK'
+    # at t/hl_mod.t line 19.
+    #        got: 'makefile'
+    #   expected: 'make'
+    "hl_mod"
   ];
 
   testConditions = with lib;