diff --git a/lib/adapters/xhr.js b/lib/adapters/xhr.js
index 4ef775b..197c3f9 100644
--- a/lib/adapters/xhr.js
+++ b/lib/adapters/xhr.js
@@ -44,7 +44,7 @@ module.exports = function xhrAdapter(resolve, reject, config) {
   if (config.auth) {
     var username = config.auth.username || '';
     var password = config.auth.password || '';
-    requestHeaders['Authorization'] = 'Basic: ' + btoa(username + ':' + password);
+    requestHeaders['Authorization'] = 'Basic ' + btoa(username + ':' + password);
   }
 
   // Create the request
diff --git a/test/specs/__setupBasicAuthTest.js b/test/specs/__setupBasicAuthTest.js
index 72846f8..3b3a4e9 100644
--- a/test/specs/__setupBasicAuthTest.js
+++ b/test/specs/__setupBasicAuthTest.js
@@ -22,7 +22,7 @@ module.exports = function setupBasicAuthTest() {
       var request = jasmine.Ajax.requests.mostRecent();
 
       // TODO uncomment this once #169 is resolved
-      // expect(request.requestHeaders['Authorization']).toEqual('Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==');
+      expect(request.requestHeaders['Authorization']).toEqual('Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==');
       done();
     }, 0);
   });