diff --git a/esphome/components/api/api_pb2.cpp b/esphome/components/api/api_pb2.cpp
index 9943c06cb14..f304c852822 100644
--- a/esphome/components/api/api_pb2.cpp
+++ b/esphome/components/api/api_pb2.cpp
@@ -931,7 +931,7 @@ uint32_t
 SubscribeLogsResponse::calculate_size() const {
   uint32_t size = 0;
   size += 2;
-  size += ProtoSize::calc_length(1, this->message_len_);
+  size += ProtoSize::calc_length_force(1, this->message_len_);
   return size;
 }
 #ifdef USE_API_NOISE
diff --git a/script/api_protobuf/api_protobuf.py b/script/api_protobuf/api_protobuf.py
index 1743d2bb340..73e0859d5eb 100755
--- a/script/api_protobuf/api_protobuf.py
+++ b/script/api_protobuf/api_protobuf.py
@@ -1028,7 +1028,8 @@ class BytesType(TypeInfo):
         )
 
     def get_size_calculation(self, name: str, force: bool = False) -> str:
-        return f"size += ProtoSize::calc_length({self.calculate_field_id_size()}, this->{self.field_name}_len_);"
+        calc_fn = "calc_length_force" if force else "calc_length"
+        return f"size += ProtoSize::{calc_fn}({self.calculate_field_id_size()}, this->{self.field_name}_len_);"
 
     def get_estimated_size(self) -> int:
         return self.calculate_field_id_size() + 8  # field ID + 8 bytes typical bytes
@@ -1109,7 +1110,8 @@ class PointerToBytesBufferType(PointerToBufferTypeBase):
         )
 
     def get_size_calculation(self, name: str, force: bool = False) -> str:
-        return f"size += ProtoSize::calc_length({self.calculate_field_id_size()}, this->{self.field_name}_len);"
+        calc_fn = "calc_length_force" if force else "calc_length"
+        return f"size += ProtoSize::{calc_fn}({self.calculate_field_id_size()}, this->{self.field_name}_len);"
 
 
 class PointerToStringBufferType(PointerToBufferTypeBase):