diff --git a/nixos/modules/services/home-automation/home-assistant.nix b/nixos/modules/services/home-automation/home-assistant.nix
index 338c61f89677..247c3074d2c9 100644
--- a/nixos/modules/services/home-automation/home-assistant.nix
+++ b/nixos/modules/services/home-automation/home-assistant.nix
@@ -317,11 +317,11 @@ in {
             };
 
             unit_system = mkOption {
-              type = types.nullOr (types.enum [ "metric" "imperial" ]);
+              type = types.nullOr (types.enum [ "metric" "us_customary" ]);
               default = null;
               example = "metric";
               description = ''
-                The unit system to use. This also sets temperature_unit, Celsius for Metric and Fahrenheit for Imperial.
+                The unit system to use. This also sets temperature_unit, Celsius for Metric and Fahrenheit for US Customary.
               '';
             };