--- a/taskcluster/comm_taskgraph/manifests/thunderbird_candidates.yml
+++ b/taskcluster/comm_taskgraph/manifests/thunderbird_candidates.yml
@@ -174,17 +174,16 @@ mapping:
         checksums_path: jsshell/jsshell-${path_platform}.zip
         destinations:
             - ${version}-candidates/build${build_number}/jsshell
     target.langpack.xpi:
         <<: *default
         all_locales: true
         description: "Localized repack that grabs a packaged en-US Thunderbird and repackages it as locale-specific Thunderbird"
         locale_prefix: ''
-        source_path_modifier: '${locale}'
         from:
             - build
         only_for_platforms:
             - linux-shippable
             - linux64-shippable
             - macosx64-shippable
             - win32-shippable
             - win64-shippable