diff --git a/py/cmdline/testing/test_cmdline.py b/py/cmdline/testing/test_cmdline.py
index 1a548a5ee..7bc7ee786 100644
--- a/py/cmdline/testing/test_cmdline.py
+++ b/py/cmdline/testing/test_cmdline.py
@@ -4,7 +4,7 @@ from py.__.test.testing.acceptance_test import AcceptBase
 class TestPyLookup(AcceptBase):
     def test_basic(self):
         p = self.makepyfile(hello="def x(): pass")
-        result = self.run("py.lookup", "pass")
+        result = self.runpybin("py.lookup", "pass")
         suptest.assert_lines_contain_lines(result.outlines, 
             ['%s:*def x(): pass' %(p.basename)]
         )