diff --git a/homeassistant/components/tcp/sensor.py b/homeassistant/components/tcp/sensor.py
index 84f925829471b..ff5db39bba755 100644
--- a/homeassistant/components/tcp/sensor.py
+++ b/homeassistant/components/tcp/sensor.py
@@ -29,7 +29,7 @@
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.template import Template
-from homeassistant.helpers.typing import ConfigType
+from homeassistant.helpers.typing import ConfigType, StateType
 
 from .const import (
     CONF_BUFFER_SIZE,
@@ -112,7 +112,7 @@ def name(self) -> str:
         return self._config[CONF_NAME]
 
     @property
-    def state(self) -> str | None:
+    def state(self) -> StateType:
         """Return the state of the device."""
         return self._state