Variable service_name is missing for systemd file
diff --git a/heka/_service.sls b/heka/_service.sls
index 6e058da..7ba1ca4 100644
--- a/heka/_service.sls
+++ b/heka/_service.sls
@@ -30,6 +30,8 @@
   - source: salt://heka/files/heka.service
   - user: root
   - mode: 644
+  - defaults:
+    service_name: {{ service_name }}
   - template: jinja
 
 {%- else %}