diff --git a/generator/config.yaml b/generator/config.yaml
index 7fe4265..43960a6 100644
--- a/generator/config.yaml
+++ b/generator/config.yaml
@@ -7,6 +7,9 @@ variables:
   doorstatus:
     topic: c3re/hhdst
     cast: bool
+  doorstatus_ts:
+    topic: c3re/hhdst_tsu
+    cast: int
   clubraum_temp:
     topic: c3re/clubraumtemp
     cast: float
diff --git a/generator/template.json b/generator/template.json
index dbe41d5..017adc1 100644
--- a/generator/template.json
+++ b/generator/template.json
@@ -16,7 +16,7 @@
   "issue_report_channels": ["email"],
   "state": {
     "open": "{{doorstatus}}",
-    "lastchange": "{{doorstatus#timestamp}}",
+    "lastchange": "{{doorstatus_ts}}",
     "icon": {
       "open": "https://c3re.de/doorstatus/open.png",
       "closed": "https://c3re.de/doorstatus/closed.png"