diff --git a/homeassistant/components/tado/__init__.py b/homeassistant/components/tado/__init__.py
index b57d384124c..0ef6dc17934 100644
--- a/homeassistant/components/tado/__init__.py
+++ b/homeassistant/components/tado/__init__.py
@@ -327,7 +327,7 @@ class TadoConnector:
                 device_type,
                 "ON",
                 mode,
-                fanSpeed=fan_speed,
+                fan_speed=fan_speed,
                 swing=swing,
             )