diff --git a/modules/libpref/Preferences.cpp b/modules/libpref/Preferences.cpp
index 417312e59583..2362b845ee06 100644
--- a/modules/libpref/Preferences.cpp
+++ b/modules/libpref/Preferences.cpp
@@ -2829,7 +2829,6 @@ static nsresult
 pref_LoadPrefsInDirList(const char* aListId);
 
 static const char kTelemetryPref[] = "toolkit.telemetry.enabled";
-static const char kOldTelemetryPref[] = "toolkit.telemetry.enabledPreRelease";
 static const char kChannelPref[] = "app.update.channel";
 
 // clang-format off
@@ -3485,12 +3484,6 @@ Preferences::InitializeUserPrefs()
   // Don't set mCurrentFile until we're done so that dirty flags work properly.
   sPreferences->mCurrentFile = prefsFile.forget();
 
-  // Migrate the old prerelease telemetry pref.
-  if (!Preferences::GetBool(kOldTelemetryPref, true)) {
-    Preferences::SetBoolInAnyProcess(kTelemetryPref, false);
-    Preferences::ClearUser(kOldTelemetryPref);
-  }
-
   sPreferences->NotifyServiceObservers(NS_PREFSERVICE_READ_TOPIC_ID);
 }