diff --git a/z_server/devices/__init__.py b/z_server/devices/__init__.py
index 93a7799..4865a8f 100644
--- a/z_server/devices/__init__.py
+++ b/z_server/devices/__init__.py
@@ -137,8 +137,8 @@ class brennenstuhl_heatingvalve(base):
         payload = json.loads(message.payload)
         #
         # heartbeat
-        #        
-	if message.topic == self.topic:
+        #
+        if message.topic == self.topic:
             self.last_device_msg = time.time()
         #
         # follow setpoint