1 files changed, 6 insertions, 3 deletions
diff --git a/toolkit/mozapps/update/tests/unit_base_updater/marAppInUseStageSuccessComplete_unix.js b/toolkit/mozapps/update/tests/unit_base_updater/marAppInUseStageSuccessComplete_unix.js
index 29c2c2a30e..faac7510d0 100644
--- a/toolkit/mozapps/update/tests/unit_base_updater/marAppInUseStageSuccessComplete_unix.js
+++ b/toolkit/mozapps/update/tests/unit_base_updater/marAppInUseStageSuccessComplete_unix.js
@@ -10,9 +10,12 @@ async function run_test() {
   }
   const STATE_AFTER_STAGE = 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);
+  if (channelPrefs) {
+    channelPrefs.originalContents = null;
+    channelPrefs.compareContents = "FromComplete\n";
+    channelPrefs.comparePerms = 0o644;
+  }
   gTestDirs = gTestDirsCompleteSuccess;
   await setupUpdaterTest(FILE_COMPLETE_MAR, true);
   setupSymLinks();