diff --git a/tests/integration/fixtures/external_components/legacy_climate_component/climate/__init__.py b/tests/integration/fixtures/external_components/legacy_climate_component/climate/__init__.py
index 08ef4f542a..0810ae02a1 100644
--- a/tests/integration/fixtures/external_components/legacy_climate_component/climate/__init__.py
+++ b/tests/integration/fixtures/external_components/legacy_climate_component/climate/__init__.py
@@ -3,6 +3,7 @@
 import esphome.codegen as cg
 from esphome.components import climate
 import esphome.config_validation as cv
+from esphome.types import ConfigType
 
 legacy_climate_ns = cg.esphome_ns.namespace("legacy_climate_test")
 LegacyClimate = legacy_climate_ns.class_("LegacyClimate", climate.Climate, cg.Component)
@@ -10,6 +11,6 @@ LegacyClimate = legacy_climate_ns.class_("LegacyClimate", climate.Climate, cg.Co
 CONFIG_SCHEMA = climate.climate_schema(LegacyClimate).extend(cv.COMPONENT_SCHEMA)
 
 
-async def to_code(config):
+async def to_code(config: ConfigType) -> None:
     var = await climate.new_climate(config)
     await cg.register_component(var, config)