diff --git a/tests/test_pam_duo.py b/tests/test_pam_duo.py
index 7e213a6..0347597 100755
--- a/tests/test_pam_duo.py
+++ b/tests/test_pam_duo.py
@@ -401,10 +401,10 @@ def test_invalid_delimiter_value_colon(self):
                     ["-d", "-c", temp.name, "true"],
                 )
                 self.assertIn(
-                    result["stderr"],
                     "Invalid gecos_delim '{delim}' (delimiter must be punctuation other than ':')".format(
                         delim=config["gecos_delim"]
                     ),
+                    result["stderr"],
                 )
                 self.assertRegexSomeline(
                     result["stderr"],