diff --git a/roles/server/spotme/defaults/main.yml b/roles/server/spotme/defaults/main.yml
index 7d694c6..2336549 100644
--- a/roles/server/spotme/defaults/main.yml
+++ b/roles/server/spotme/defaults/main.yml
@@ -2,7 +2,7 @@
 
 domain: "spotme.localhost"
 
-spotme_system_user: "spotme"
+spotme_system_user: "{{ domain | regex_replace('[^A-Za-z0-9-]+', '-') }}"
 spotme_service_name: "{{ domain }}.service"
 spotme_port: 12820