diff --git a/scripts/fan_controller.py b/scripts/fan_controller.py
index 563ffbd..680f064 100644
--- a/scripts/fan_controller.py
+++ b/scripts/fan_controller.py
@@ -26,7 +26,7 @@ fans = [
 ]
 
 
-def get_temp(channel) -> float:
+def get_temp(channel: dict) -> float:
     match channel["type"]:
         case "RTD":
             return read_temp(stack=channel["stack"], channel=channel["channel"])