diff --git a/unittests/test_issues.py b/unittests/test_issues.py
index d284c2b2ca177750054e189560d13b9459c87ec6..2c45a6d77ba61c3f948e403f708994c0fe31481a 100644
--- a/unittests/test_issues.py
+++ b/unittests/test_issues.py
@@ -36,4 +36,4 @@ def test_issue_100():
     xml_el = lxml.etree.parse(filename).getroot()
     with raises(TypeError) as exc_info:
         db.common.models._parse_single_xml_element(xml_el)
-    assert "Invalid datatype: List valued properties" in exc_info.value.msg
+    assert "Invalid datatype: List valued properties" in str(exc_info.value)