diff --git a/homeassistant/components/knx/climate.py b/homeassistant/components/knx/climate.py
index 4b5998016e1..d9b7ba58ab2 100644
--- a/homeassistant/components/knx/climate.py
+++ b/homeassistant/components/knx/climate.py
@@ -219,7 +219,7 @@ class KNXClimate(ClimateDevice):
     @property
     def target_temperature_step(self):
         """Return the supported step of target temperature."""
-        return self.device.temperature_step
+        return self.device.setpoint_shift_step
 
     @property
     def target_temperature(self):