1 files changed, 1 insertions, 2 deletions
diff --git a/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartialWhileBackgroundTaskRunning.js b/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartialWhileBackgroundTaskRunning.js
index 37511bd789..e80e52e9a3 100644
--- a/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartialWhileBackgroundTaskRunning.js
+++ b/toolkit/mozapps/update/tests/unit_base_updater/marSuccessPartialWhileBackgroundTaskRunning.js
@@ -45,8 +45,7 @@ async function run_test() {
   // won't be updated if it already exists.  The manipulations below arrange a)
   // for the file to exist and b) for the comparison afterward to succeed.
   gTestFiles = gTestFilesPartialSuccess;
-  let channelPrefs = gTestFiles[gTestFiles.length - 1];
-  Assert.equal("channel-prefs.js", channelPrefs.fileName);
+  let channelPrefs = getTestFileByName(FILE_CHANNEL_PREFS);
   let f = gGREDirOrig.clone();
   f.append("defaults");
   f.append("pref");