diff --git a/salttesting/case.py b/salttesting/case.py
index 4918915..19e47cc 100644
--- a/salttesting/case.py
+++ b/salttesting/case.py
@@ -140,14 +140,14 @@ class ShellTestCase(TestCase, AdaptedConfigurationTestCaseMixIn):
         )
         return self.run_script('salt-ssh', arg_str, with_retcode=with_retcode, catch_stderr=catch_stderr, raw=True)
 
-    def run_run(self, arg_str, with_retcode=False, catch_stderr=False, async=False, timeout=60, config_dir=None):
+    def run_run(self, arg_str, with_retcode=False, catch_stderr=False, async_flag=False, timeout=60, config_dir=None):
         '''
         Execute salt-run
         '''
         arg_str = '-c {0}{async_flag} -t {timeout} {1}'.format(config_dir or self.get_config_dir(),
                                                  arg_str,
                                                  timeout=timeout,
-                                                 async_flag=' --async' if async else '')
+                                                 async_flag=' --async' if async_flag else '')
         return self.run_script('salt-run', arg_str, with_retcode=with_retcode, catch_stderr=catch_stderr)
 
     def run_run_plus(self, fun, *arg, **kwargs):