diff --git a/quiche/quic/core/crypto/tls_server_connection.cc b/quiche/quic/core/crypto/tls_server_connection.cc
index 39e2f4a..2b7ddc7 100644
--- a/quiche/quic/core/crypto/tls_server_connection.cc
+++ b/quiche/quic/core/crypto/tls_server_connection.cc
@@ -95,6 +95,8 @@
           trust_anchor_id.size());
       SSL_CREDENTIAL_set_must_match_issuer(credential, 1);
     }
+#else
+    (void)trust_anchor_id;  // Suppress unused parameter error.
 #endif
     SSL_add1_credential(ssl(), credential);
     SSL_CREDENTIAL_free(credential);