diff --git a/test/case/infix_dhcp/dhcp_basic/topology.svg b/test/case/infix_dhcp/dhcp_basic/topology.svg
index 168182b8..5bc27100 100644
--- a/test/case/infix_dhcp/dhcp_basic/topology.svg
+++ b/test/case/infix_dhcp/dhcp_basic/topology.svg
@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Generated by graphviz version 2.43.0 (0)
- -->
+
 <!-- Title: 1x2 Pages: 1 -->
 <svg width="474pt" height="55pt"
  viewBox="0.00 0.00 474.04 55.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">