diff --git a/roles/k3s_server/templates/k3s.service.j2 b/roles/k3s_server/templates/k3s.service.j2
index 2d2886b..e415005 100644
--- a/roles/k3s_server/templates/k3s.service.j2
+++ b/roles/k3s_server/templates/k3s.service.j2
@@ -27,5 +27,5 @@ ExecStartPre=-/sbin/modprobe br_netfilter
 ExecStartPre=-/sbin/modprobe overlay
 ExecStart=/usr/local/bin/k3s server --data-dir {{ k3s_server_location }} {% if cluster_init == true %}--cluster-init {% endif %} \
     {% if join == true %}--server https://{{ api_endpoint }}:{{ api_port }} {% endif %} \
-    {{ opt_tls_san }} \
-    {{ extra_server_args }} 
+    {{ opt_tls_san | default('') }} \
+    {{ extra_server_args }}