diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index fda0324..a8fd49b 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -1663,7 +1663,7 @@
     {
         ciph_offset = 35 + sess_len;
     }
-#endif
+#endif /* MBEDTLS_SSL_PROTO_TLS */
 
     ciph_len = ( buf[ciph_offset + 0] << 8 )
              | ( buf[ciph_offset + 1]      );