diff --git a/packages/react-devtools-extensions/src/inject.js b/packages/react-devtools-extensions/src/inject.js
index 02750dbb06a8..909a192b53e5 100644
--- a/packages/react-devtools-extensions/src/inject.js
+++ b/packages/react-devtools-extensions/src/inject.js
@@ -3,7 +3,7 @@
 export default function inject(scriptName: string, done: ? Function) {
   const source = `
   (function () {
-    window.postMessage({ source: 'react-devtools-inject-backend', type: "FROM_PAGE", text: "Hello from the webpage!" }, "*");
+    window.postMessage({ source: 'react-devtools-inject-script', scriptName: "${scriptName}" }, "*");
   })()
   `;
 
diff --git a/packages/react-devtools-extensions/src/injectGlobalHook.js b/packages/react-devtools-extensions/src/injectGlobalHook.js
index a06b9bbf6294..e35c675e1f29 100644
--- a/packages/react-devtools-extensions/src/injectGlobalHook.js
+++ b/packages/react-devtools-extensions/src/injectGlobalHook.js
@@ -37,10 +37,10 @@ window.addEventListener('message', function(evt) {
         reactBuildType: evt.data.reactBuildType,
       };
       chrome.runtime.sendMessage(lastDetectionResult);
-    } else if (evt.data.source === 'react-devtools-inject-backend') {
+    } else if (evt.data.source === 'react-devtools-inject-backend' && evt.data.scriptName) {
       //Inject backend
       var script = document.constructor.prototype.createElement.call(document, 'script');
-      script.src = chrome.runtime.getURL('build/backend.js');
+      script.src = evt.data.scriptName;
       script.charset = "utf-8";
       document.documentElement.appendChild(script);
       script.parentNode.removeChild(script);
@@ -97,4 +97,4 @@ if (sessionStorageGetItem(SESSION_STORAGE_RELOAD_AND_PROFILE_KEY) === 'true') {
 // devtools are installed (and skip its suggestion to install the devtools).
 injectCode(
   ';(' + installHook.toString() + '(window))' + saveNativeValues + detectReact,
-);
\ No newline at end of file
+);