diff --git a/mitogen/su.py b/mitogen/su.py
index 5f52e08b..b0bac28b 100644
--- a/mitogen/su.py
+++ b/mitogen/su.py
@@ -32,6 +32,11 @@ import mitogen.core
 import mitogen.parent
 from mitogen.core import b
 
+try:
+    any
+except NameError:
+    from mitogen.core import any
+
 
 LOG = logging.getLogger(__name__)
 
diff --git a/tests/su_test.py b/tests/su_test.py
new file mode 100644
index 00000000..2af17c6e
--- /dev/null
+++ b/tests/su_test.py
@@ -0,0 +1,32 @@
+
+import os
+
+import mitogen
+import mitogen.lxd
+import mitogen.parent
+
+import unittest2
+
+import testlib
+
+
+class ConstructorTest(testlib.RouterMixin, testlib.TestCase):
+    su_path = testlib.data_path('stubs/stub-su.py')
+
+    def run_su(self, **kwargs):
+        context = self.router.su(
+            su_path=self.su_path,
+            **kwargs
+        )
+        argv = eval(context.call(os.getenv, 'ORIGINAL_ARGV'))
+        return context, argv
+
+
+    def test_basic(self):
+        context, argv = self.run_su()
+        self.assertEquals(argv[1], 'root')
+        self.assertEquals(argv[2], '-c')
+
+
+if __name__ == '__main__':
+    unittest2.main()