diff --git a/fetch.js b/fetch.js
index 29c985942f4c151836cb7467694a506a10b154b8..104d873851eff73bd95482cfd4105ecd1264a5a0 100644
--- a/fetch.js
+++ b/fetch.js
@@ -186,6 +186,16 @@
     return promise
   }
 
+  function readArrayBufferAsText(buf) {
+    var view = new Uint8Array(buf)
+    var chars = new Array(view.length)
+
+    for (var i = 0; i < view.length; i++) {
+      chars[i] = String.fromCharCode(view[i])
+    }
+    return chars.join('')
+  }
+
   function bufferClone(buf) {
     if (buf.slice) {
       return buf.slice(0)
@@ -260,9 +270,7 @@
       if (this._bodyBlob) {
         return readBlobAsText(this._bodyBlob)
       } else if (this._bodyArrayBuffer) {
-        var view = new Uint8Array(this._bodyArrayBuffer)
-        var str = String.fromCharCode.apply(null, view)
-        return Promise.resolve(str)
+        return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer))
       } else if (this._bodyFormData) {
         throw new Error('could not read FormData body as text')
       } else {
diff --git a/test/test.js b/test/test.js
index 3044b94e9258961c42cca0bf52c9b7a9bd1c0032..e1b2270fc1853a18767da2f23ed9dbaabe4a740b 100644
--- a/test/test.js
+++ b/test/test.js
@@ -64,7 +64,13 @@ function arrayBufferFromText(text) {
 }
 
 function readArrayBufferAsText(buf) {
-  return String.fromCharCode.apply(null, new Uint8Array(buf))
+  var view = new Uint8Array(buf)
+  var chars = new Array(view.length)
+
+  for (var i = 0; i < view.length; i++) {
+    chars[i] = String.fromCharCode(view[i])
+  }
+  return chars.join('')
 }
 
 var native = {}