diff --git a/mqtt_io/modules/sensor/as3935.py b/mqtt_io/modules/sensor/as3935.py
index b4334d7b..4b1df94c 100644
--- a/mqtt_io/modules/sensor/as3935.py
+++ b/mqtt_io/modules/sensor/as3935.py
@@ -226,7 +226,7 @@ def increase_threshold(self) -> None:
         _LOG.debug("as3935: Increasing the disturber watchdog threshold to %s", value)
         self.lightning.watchdog_threshold = value
 
-    def get_value(self, value) -> float:
+    def get_value(self, value: str) -> float:
         """ Return the value of 'type' """
         ret = float(self.data[value])
         return ret