diff --git a/notebook/jstest.py b/notebook/jstest.py
index 684ebf19d..0e531f64f 100644
--- a/notebook/jstest.py
+++ b/notebook/jstest.py
@@ -324,8 +324,6 @@ class JSController(TestController):
         c.start()
         env = os.environ.copy()
         env.update(self.env)
-        if self.engine == 'phantomjs':
-            env['IPYTHON_ALLOW_DRAFT_WEBSOCKETS_FOR_PHANTOMJS'] = '1'
         self.server = subprocess.Popen(command,
             stdout = c.writefd,
             stderr = subprocess.STDOUT,
diff --git a/notebook/tests/services/serialize.js b/notebook/tests/services/serialize.js
index 6d5045b93..e44ea4704 100644
--- a/notebook/tests/services/serialize.js
+++ b/notebook/tests/services/serialize.js
@@ -4,10 +4,6 @@
 //
 
 casper.notebook_test(function () {
-    if (!this.slimerjs) {
-        console.log("Can't test binary websockets on phantomjs.");
-        return;
-    }
     // create EchoBuffers target on js-side.
     // it just captures and echos comm messages.
     this.then(function () {