diff --git a/fastapi_filter_sqlalchemy/constants.py b/fastapi_filter_sqlalchemy/constants.py
new file mode 100644
index 0000000..59fea74
--- /dev/null
+++ b/fastapi_filter_sqlalchemy/constants.py
@@ -0,0 +1 @@
+EMPTY_STRING = ""
diff --git a/fastapi_filter_sqlalchemy/filter_sqlalchemy.py b/fastapi_filter_sqlalchemy/filter_sqlalchemy.py
index ba14aa5..568e01e 100644
--- a/fastapi_filter_sqlalchemy/filter_sqlalchemy.py
+++ b/fastapi_filter_sqlalchemy/filter_sqlalchemy.py
@@ -4,11 +4,12 @@
 from warnings import warn
 
 from pydantic import ValidationInfo, field_validator
-from sqlalchemy import Integer, String, cast, func, or_
+from sqlalchemy import BigInteger, String, cast, func, or_
 from sqlalchemy.orm import Query
 from sqlalchemy.sql.selectable import Select
 
 from .base import BaseFilterModel
+from .constants import EMPTY_STRING
 
 
 def _backward_compatible_value_for_like_and_ilike(value: str):
@@ -212,19 +213,21 @@ def sort(self, query: Query | Select):
 
             field_name = field_name.replace("-", "").replace("+", "")
             order_by_field = getattr(self.Constants.model, field_name)
+            additional_field_name = EMPTY_STRING
             if field_name in self.Constants.ordering_convert_str_to_int_fields:
-                order_by_field = cast(order_by_field, Integer)
-                query = query.add_columns(
-                    cast(getattr(self.Constants.model, field_name), Integer).label(f"{field_name}_integer_value")
-                )
+                order_by_field = cast(order_by_field, BigInteger)
+                additional_field_name = "integer_value"
             if field_name in self.Constants.ordering_lower_case_fields:
                 order_by_field = func.lower(order_by_field)
-                query = query.add_columns(
-                    func.lower(getattr(self.Constants.model, field_name)).label(f"{field_name}_lower_case")
-                )
+                additional_field_name = "lower_case"
             if field_name in self.Constants.ordering_fk_fields_mapping:
                 model = self.Constants.ordering_fk_fields_mapping[field_name]
                 order_by_field = getattr(model, base_field_name)
+
+            # Here add new columns, so that you can sort by them.
+            if additional_field_name is not EMPTY_STRING:
+                query = query.add_columns(order_by_field.label(f"{field_name}_{additional_field_name}"))
+
             query = query.order_by(getattr(order_by_field, direction)())
 
         return query
diff --git a/pyproject.toml b/pyproject.toml
index e3a19e8..811ca53 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ ignore_missing_imports = true
 
 [tool.poetry]
 name = "fastapi-filter-sqlalchemy"
-version = "0.0.4"
+version = "0.0.5"
 description = "FastAPI filter SQLAlchemy"
 authors = ["Sergey V. Elfimov <elfimovserg@gmail.com>"]
 packages = [{include = "fastapi_filter_sqlalchemy"}]