diff --git a/testing/tests/tnc/tnccs-20-pdp-eap/hosts/carol/etc/strongswan.conf b/testing/tests/tnc/tnccs-20-pdp-eap/hosts/carol/etc/strongswan.conf
index 13dab0a23e..ee16a4cad2 100644
--- a/testing/tests/tnc/tnccs-20-pdp-eap/hosts/carol/etc/strongswan.conf
+++ b/testing/tests/tnc/tnccs-20-pdp-eap/hosts/carol/etc/strongswan.conf
@@ -11,8 +11,8 @@ charon {
       max_message_count = 0
     }
     tnccs-20 {
-      max_batch_size = 32754
-      max_message_size = 32722
+      max_batch_size = 16370
+      max_message_size = 16338
     }
   }
 }