diff --git a/homeassistant/components/modbus/climate.py b/homeassistant/components/modbus/climate.py
index 76132014413..aa345324dc8 100644
--- a/homeassistant/components/modbus/climate.py
+++ b/homeassistant/components/modbus/climate.py
@@ -125,7 +125,6 @@ class ModbusThermostat(BaseStructPlatform, RestoreEntity, ClimateEntity):
         )
         self._attr_min_temp = config[CONF_MIN_TEMP]
         self._attr_max_temp = config[CONF_MAX_TEMP]
-        self._attr_target_temperature_step = config[CONF_TARGET_TEMP]
         self._attr_target_temperature_step = config[CONF_STEP]
 
         if CONF_HVAC_MODE_REGISTER in config: