diff --git a/roles/debianlive/tasks/main.yml b/roles/debianlive/tasks/main.yml
index 11a7f0a..4241ba5 100644
--- a/roles/debianlive/tasks/main.yml
+++ b/roles/debianlive/tasks/main.yml
@@ -58,10 +58,13 @@
 - name: configure grub boot menu addresses
   lineinfile:
     path: /etc/di-netboot-assistant/grub.cfg.HEAD
-    line: "{{ item }}"
+    line: "{{ item.line }}"
+    regexp: "{{ item.reg }}"
   loop:
-    - "set root=(http,{{ ansible_default_ipv4.address }})"
-    - "set pxe_default_server={{ ansible_default_ipv4.address }}"
+    - line: "set root=(http,{{ ansible_default_ipv4.address }})"
+      reg: "^set root="
+    - line: "set pxe_default_server={{ ansible_default_ipv4.address }}"
+      reg: "^set pxe_default_server="
   notify: rebuild di-netboot menu
 
 - name: prepare debian live nfs boot entry title