1 files changed, 4 insertions, 3 deletions
diff --git a/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartial.js b/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartial.js
index 8e8e9d094a..f4f856278c 100644
--- a/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartial.js
+++ b/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartial.js
@@ -10,9 +10,10 @@ async function run_test() {
     return;
   }
   gTestFiles = gTestFilesPartialSuccess;
-  gTestFiles[gTestFiles.length - 1].originalContents = null;
-  gTestFiles[gTestFiles.length - 1].compareContents = "FromPartial\n";
-  gTestFiles[gTestFiles.length - 1].comparePerms = 0o644;
+  const channelPrefs = getTestFileByName(FILE_CHANNEL_PREFS);
+  channelPrefs.originalContents = null;
+  channelPrefs.compareContents = "FromPartial\n";
+  channelPrefs.comparePerms = 0o644;
   gTestDirs = gTestDirsPartialSuccess;
   // The third parameter will test that a relative path that contains a
   // directory traversal to the post update binary doesn't execute.