diff --git a/lib/util/player_configuration.js b/lib/util/player_configuration.js
index 1a9c76bb94..ffa0e987ac 100644
--- a/lib/util/player_configuration.js
+++ b/lib/util/player_configuration.js
@@ -67,7 +67,9 @@ shaka.util.PlayerConfiguration = class {
       advanced: {},    // key is arbitrary key system ID, value is a record type
       delayLicenseRequestUntilPlayed: false,
       initDataTransform: (initData, initDataType, drmInfo) => {
-        return initData;
+        return shaka.util.ConfigUtils.referenceParametersAndReturn(
+            [initData, initDataType, drmInfo],
+            initData);
       },
       logLicenseExchange: false,
       updateExpirationTime: 1,