diff --git a/test/unittest/security/authentication/AuthenticationPluginTests.hpp b/test/unittest/security/authentication/AuthenticationPluginTests.hpp
index e0aa5e610a8..77cdcff87e3 100644
--- a/test/unittest/security/authentication/AuthenticationPluginTests.hpp
+++ b/test/unittest/security/authentication/AuthenticationPluginTests.hpp
@@ -165,6 +165,7 @@ TEST_F(AuthenticationPluginTest, handshake_process_ok)
             ValidationResult_t::VALIDATION_FAILED;
 
     participant_attr.properties = get_valid_policy();
+    participant_attr.properties.properties().emplace_back("dds.sec.auth.builtin.PKI-DH.preferred_key_agreement", "DH");
 
     result = plugin.validate_local_identity(&local_identity_handle1,
                     adjusted_participant_key1,