diff --git a/test/test_xr_kernel.py b/test/test_xr_kernel.py
index 1d9d4e3..ccc4caa 100644
--- a/test/test_xr_kernel.py
+++ b/test/test_xr_kernel.py
@@ -31,11 +31,11 @@ def test_stdout(self):
         self.assertEqual(output_msgs[0]["content"]["name"], "stdout")
         self.assertEqual(output_msgs[0]["content"]["text"], "hello, world")
 
-    #def test_stderr(self):
-        #self.flush_channels()
-        #reply, output_msgs = self.execute_helper(code="error")
-        #self.assertEqual(output_msgs[0]["msg_type"], "stream")
-        #self.assertEqual(output_msgs[0]["content"]["name"], "stderr")
+    def test_stderr(self):
+        self.flush_channels()
+        reply, output_msgs = self.execute_helper(code="message('error')")
+        self.assertEqual(output_msgs[0]["msg_type"], "stream")
+        self.assertEqual(output_msgs[0]["content"]["name"], "stderr")
 
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