diff --git a/jenkins/__init__.py b/jenkins/__init__.py
index eb288f5..6bcab6f 100755
--- a/jenkins/__init__.py
+++ b/jenkins/__init__.py
@@ -1386,12 +1386,13 @@ class Jenkins(object):
         # run_script is an async call to run groovy. we need to wait a little
         # before we can get a reliable response on whether a restart is needed
         time.sleep(2)
-        is_restart_required = ('Jenkins.instance.updateCenter'
-                               '.isRestartRequiredForCompletion()')
+        is_restart_required = ('println('
+                               'Jenkins.instance.updateCenter'
+                               '.isRestartRequiredForCompletion()'
+                               ')')
 
-        # response is a string (i.e. u'Result: true\n'), return a bool instead
         response_str = self.run_script(is_restart_required)
-        response = response_str.split(':')[1].strip().lower() == 'true'
+        response = response_str.strip().lower() == 'true'
         return response
 
     def stop_build(self, name, number):
diff --git a/tests/test_script.py b/tests/test_script.py
index c39603e..1207406 100644
--- a/tests/test_script.py
+++ b/tests/test_script.py
@@ -67,8 +67,8 @@ class JenkinsScriptTest(JenkinsTestBase):
                           '.getNeededDependencies().each{it.deploy()};Jenkins'
                           '.instance.updateCenter.getPlugin(\"jabber\").deploy();'))
         self.assertEqual(run_script_mock.call_args_list[1][0][0],
-                         ('Jenkins.instance.updateCenter'
-                          '.isRestartRequiredForCompletion()'))
+                         ('println(Jenkins.instance.updateCenter'
+                          '.isRestartRequiredForCompletion())'))
 
     @patch.object(jenkins.Jenkins, 'jenkins_open')
     @patch.object(jenkins.Jenkins, 'run_script')
@@ -82,17 +82,17 @@ class JenkinsScriptTest(JenkinsTestBase):
                          ('Jenkins.instance.updateCenter'
                           '.getPlugin(\"jabber\").deploy();'))
         self.assertEqual(run_script_mock.call_args_list[1][0][0],
-                         ('Jenkins.instance.updateCenter'
-                          '.isRestartRequiredForCompletion()'))
+                         ('println(Jenkins.instance.updateCenter'
+                          '.isRestartRequiredForCompletion())'))
 
-    @patch.object(jenkins.Jenkins, 'jenkins_open', return_value='\n{}'.format(MAGIC_STR))
+    @patch.object(jenkins.Jenkins, 'jenkins_open', return_value='false\n{}'.format(MAGIC_STR))
     def test_install_plugin_no_restart(self, jenkins_mock):
         '''Verify install plugin does not need a restart
         '''
         j = jenkins.Jenkins(self.make_url(''), 'test', 'test')
         self.assertFalse(j.install_plugin("jabber"))
 
-    @patch.object(jenkins.Jenkins, 'jenkins_open', return_value='\n{}'.format(MAGIC_STR))
+    @patch.object(jenkins.Jenkins, 'jenkins_open', return_value='true\n{}'.format(MAGIC_STR))
     def test_install_plugin_restart(self, jenkins_mock):
         '''Verify install plugin needs a restart
         '''