diff --git a/esphome/cpp_generator.py b/esphome/cpp_generator.py
index 0e711f64e1..e2dbbf3d43 100644
--- a/esphome/cpp_generator.py
+++ b/esphome/cpp_generator.py
@@ -654,7 +654,7 @@ async def process_lambda(
     parameters: list[tuple[SafeExpType, str]],
     capture: str = "=",
     return_type: SafeExpType = None,
-) -> LambdaExpression | None:
+) -> Optional[LambdaExpression]:
     """Process the given lambda value into a LambdaExpression.
 
     This is a coroutine because lambdas can depend on other IDs,