1 files changed, 4 insertions, 3 deletions
diff --git a/toolkit/mozapps/update/tests/unit_service_updater/marStageSuccessCompleteSvc.js b/toolkit/mozapps/update/tests/unit_service_updater/marStageSuccessCompleteSvc.js
index 943a45ba95..2c9c3298d4 100644
--- a/toolkit/mozapps/update/tests/unit_service_updater/marStageSuccessCompleteSvc.js
+++ b/toolkit/mozapps/update/tests/unit_service_updater/marStageSuccessCompleteSvc.js
@@ -11,9 +11,10 @@ async function run_test() {
   }
   const STATE_AFTER_STAGE = gIsServiceTest ? STATE_APPLIED_SVC : STATE_APPLIED;
   gTestFiles = gTestFilesCompleteSuccess;
-  gTestFiles[gTestFiles.length - 1].originalContents = null;
-  gTestFiles[gTestFiles.length - 1].compareContents = "FromComplete\n";
-  gTestFiles[gTestFiles.length - 1].comparePerms = 0o644;
+  const channelPrefs = getTestFileByName(FILE_CHANNEL_PREFS);
+  channelPrefs.originalContents = null;
+  channelPrefs.compareContents = "FromComplete\n";
+  channelPrefs.comparePerms = 0o644;
   gTestDirs = gTestDirsCompleteSuccess;
   setupSymLinks();
   await setupUpdaterTest(FILE_COMPLETE_MAR, false);