diff --git a/tests/unit-tests/config-files/config-ca-2 b/tests/unit-tests/config-files/config-ca-2
index 9b7c2bd..0c87ec9 100644
--- a/tests/unit-tests/config-files/config-ca-2
+++ b/tests/unit-tests/config-files/config-ca-2
@@ -3,7 +3,6 @@
   "ca-info": "missing max validity period, max suffix length, and probe",
   "supported-challenges":
   [
-      { "challenge": "pin" },
-      { "challenge": "email" }
+      { "challenge": "pin" }
   ]
 }
\ No newline at end of file
diff --git a/tests/unit-tests/configuration.t.cpp b/tests/unit-tests/configuration.t.cpp
index f193432..999b0a9 100644
--- a/tests/unit-tests/configuration.t.cpp
+++ b/tests/unit-tests/configuration.t.cpp
@@ -48,9 +48,8 @@
   BOOST_CHECK_EQUAL(config.m_caProfile.m_maxValidityPeriod, time::seconds(86400));
   BOOST_CHECK(!config.m_caProfile.m_maxSuffixLength.has_value());
   BOOST_CHECK_EQUAL(config.m_caProfile.m_probeParameterKeys.size(), 0);
-  BOOST_CHECK_EQUAL(config.m_caProfile.m_supportedChallenges.size(), 2);
+  BOOST_CHECK_EQUAL(config.m_caProfile.m_supportedChallenges.size(), 1);
   BOOST_CHECK_EQUAL(config.m_caProfile.m_supportedChallenges.front(), "pin");
-  BOOST_CHECK_EQUAL(config.m_caProfile.m_supportedChallenges.back(), "email");
 
   config.load("tests/unit-tests/config-files/config-ca-5");
   BOOST_CHECK_EQUAL(config.m_redirection[0]->getName(),