diff --git a/user.js b/user.js
index 552790e..6c85155 100644
--- a/user.js
+++ b/user.js
@@ -230,7 +230,6 @@ user_pref("toolkit.telemetry.unified", false);
 user_pref("toolkit.telemetry.enabled", false); // see [NOTE] above FF58+
 user_pref("toolkit.telemetry.server", "data:,");
 user_pref("toolkit.telemetry.archive.enabled", false);
-user_pref("toolkit.telemetry.cachedClientID", "");
 user_pref("toolkit.telemetry.newProfilePing.enabled", false); // [FF55+]
 user_pref("toolkit.telemetry.shutdownPingSender.enabled", false); // [FF55+]
 user_pref("toolkit.telemetry.updatePing.enabled", false); // [FF56+]