diff --git a/tasks/main.yml b/tasks/main.yml
index e79851a..f2e7979 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -26,8 +26,8 @@
 - name: Create machinectl bash alias
   lineinfile:
     path: "/home/{{ item }}/.bashrc"
-    regexp: '^alias su='
-    line: "alias su=\"machinectl shell --uid\""
+    regexp: '^su() '
+    line: "su() { if [[ $1 == "-" ]]; then command machinectl shell --uid "$2"; else command machinectl shell --uid "$1"; fi; }"
   loop: "{{ service_users }}"
 
 - lineinfile: