diff --git a/testing/test_junitxml.py b/testing/test_junitxml.py
index 82ed7901c..ba7b43826 100644
--- a/testing/test_junitxml.py
+++ b/testing/test_junitxml.py
@@ -169,7 +169,7 @@ class TestPython(object):
         node = dom.find_first_by_tag("testsuite")
         tnode = node.find_first_by_tag("testcase")
         val = tnode["time"]
-        assert 0.01 <= round(float(val), 2) < 0.02
+        assert 0.01 <= round(float(val), 3) < 0.02
 
     def test_setup_error(self, testdir):
         testdir.makepyfile(