diff --git a/tasks/build/preconfigure-k3s.yml b/tasks/build/preconfigure-k3s.yml
index 5456724..ffd070e 100644
--- a/tasks/build/preconfigure-k3s.yml
+++ b/tasks/build/preconfigure-k3s.yml
@@ -86,7 +86,7 @@
   block:
     - name: Lookup control node from file
       ansible.builtin.command:
-        cmd: "grep '{{ 'P_True' if (k3s_controller_list | length > 1) else 'C_True' }}' /tmp/inventory.txt"
+        cmd: "grep -i '{{ 'P_True' if (k3s_controller_list | length > 1) else 'C_True' }}' /tmp/inventory.txt"
       changed_when: false
       check_mode: false
       register: k3s_control_delegate_raw