diff --git a/Lib/test/test_trace.py b/Lib/test/test_trace.py
index 48fc0abb141..33d7aa14693 100644
--- a/Lib/test/test_trace.py
+++ b/Lib/test/test_trace.py
@@ -329,6 +329,8 @@ class TestCoverage(unittest.TestCase):
         for line in stdout:
             lines, cov, module = line.split()[:3]
             coverage[module] = (int(lines), int(cov[:-1]))
+        # XXX This is needed to run regrtest.py as a script
+        modname = trace.fullmodname(sys.modules[modname].__file__)
         self.assertIn(modname, coverage)
         self.assertEqual(coverage[modname], (5, 100))