diff --git a/esphome/const.py b/esphome/const.py
index d42ee5ee72..6a643e1e30 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1095,7 +1095,7 @@ UNIT_STEPS = "steps"
 UNIT_VOLT = "V"
 UNIT_VOLT_AMPS = "VA"
 UNIT_VOLT_AMPS_HOURS = "VAh"
-UNIT_VOLT_AMPS_REACTIVE = "VAR"
+UNIT_VOLT_AMPS_REACTIVE = "var"
 UNIT_VOLT_AMPS_REACTIVE_HOURS = "VARh"
 UNIT_WATT = "W"
 UNIT_WATT_HOURS = "Wh"