diff --git a/lib/Page.js b/lib/Page.js
index 9e52fd41082..2499c4972d7 100644
--- a/lib/Page.js
+++ b/lib/Page.js
@@ -87,8 +87,8 @@ class Page extends EventEmitter {
      * @return {!Promise}
      */
     async injectFile(filePath) {
-        var scriptContent = fs.readFileSync(filePath, 'utf8');
-        await this.evaluate(scriptContent);
+        var code = fs.readFileSync(filePath, 'utf8');
+        await helpers.evaluateText(this._client, code, false /* awaitPromise */);
     }
 
     /**
diff --git a/lib/helpers.js b/lib/helpers.js
index d7a19c1ce29..f71c98b4db6 100644
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -54,8 +54,18 @@ var helpers = module.exports = {
      */
     evaluate: function(client, fun, args, awaitPromise, sourceURL) {
         var code = helpers.evaluationString(fun, args, awaitPromise, sourceURL);
+        return helpers.evaluateText(client, code, awaitPromise);
+    },
+
+    /**
+     * @param {!CDP} client
+     * @param {string} text
+     * @param {boolean} awaitPromise
+     * @return {!Promise<!Object>}
+     */
+    evaluateText: function(client, text, awaitPromise) {
         return client.send('Runtime.evaluate', {
-            expression: code,
+            expression: text,
             awaitPromise: awaitPromise,
             returnByValue: true
         });