diff --git a/src/streaming/protection/drm/KeySystemClearKey.js b/src/streaming/protection/drm/KeySystemClearKey.js
index e877cb2b24..eafda0fcf3 100644
--- a/src/streaming/protection/drm/KeySystemClearKey.js
+++ b/src/streaming/protection/drm/KeySystemClearKey.js
@@ -111,7 +111,7 @@ function KeySystemClearKey(config) {
     }
 
     function getLicenseRequestFromMessage(message) {
-        return JSON.parse(String.fromCharCode.apply(null, new Uint8Array(message)));
+        return JSON.stringify(JSON.parse(String.fromCharCode.apply(null, new Uint8Array(message))));
     }
 
     function getLicenseServerURLFromInitData(/*initData*/) {