diff --git a/test/broker/08-ssl-connect-identity.conf b/test/broker/08-ssl-connect-identity.conf
index 2b2640a8..0da7edb2 100644
--- a/test/broker/08-ssl-connect-identity.conf
+++ b/test/broker/08-ssl-connect-identity.conf
@@ -5,5 +5,6 @@ certfile ../ssl/server.crt
 keyfile ../ssl/server.key
 
 use_identity_as_username true
+require_certificate true
 
 tls_version tlsv1