diff --git a/homeassistant/components/homematic/entity.py b/homeassistant/components/homematic/entity.py
index 44e95e98f38..bf029b2806d 100644
--- a/homeassistant/components/homematic/entity.py
+++ b/homeassistant/components/homematic/entity.py
@@ -99,10 +99,10 @@ class HMDevice(Entity):
 
         return attr
 
-    def update(self):
+    def update(self) -> None:
         """Connect to HomeMatic init values."""
         if self._connected:
-            return True
+            return
 
         # Initialize
         self._homematic = self.hass.data[DATA_HOMEMATIC]