diff --git a/papermerge/core/db/doc.py b/papermerge/core/db/doc.py
index 8ce65157d..75be48a2d 100644
--- a/papermerge/core/db/doc.py
+++ b/papermerge/core/db/doc.py
@@ -18,6 +18,7 @@
     Page,
 )
 from papermerge.core.exceptions import InvalidDateFormat
+from papermerge.core.types import OrderEnum
 
 from .common import get_ancestors
 
@@ -336,7 +337,7 @@ def get_docs_by_type(
     type_id: UUID,
     user_id: UUID,
     order_by: str | None = None,
-    order: str = "desc",
+    order: OrderEnum = OrderEnum.desc,
 ) -> list[schemas.DocumentCFV]:
     """
     Returns list of documents + doc CFv for all documents with of given type
@@ -349,7 +350,7 @@ def get_docs_by_type(
         params = {"document_type_id": str_type_id}
         rows = session.execute(text(stmt), params)
     else:
-        stmt = STMT_WITH_ORDER_BY.format(order=order)
+        stmt = STMT_WITH_ORDER_BY.format(order=order.value)
         params = {"document_type_id": str_type_id, "custom_field_name": order_by}
         rows = session.execute(text(stmt), params)
 
diff --git a/papermerge/core/routers/documents.py b/papermerge/core/routers/documents.py
index 5e35dcf59..0a3416877 100644
--- a/papermerge/core/routers/documents.py
+++ b/papermerge/core/routers/documents.py
@@ -12,6 +12,7 @@
 from papermerge.core import db, schemas, utils
 from papermerge.core.auth import get_current_user, scopes
 from papermerge.core.models import Document
+from papermerge.core.types import OrderEnum
 
 router = APIRouter(
     prefix="/documents",
@@ -32,7 +33,7 @@ def get_documents_by_type(
     ],
     db_session: db.Session = Depends(db.get_session),
     order_by: str | None = None,
-    order: str = "desc",
+    order: OrderEnum = OrderEnum.desc,
 ) -> list[schemas.DocumentCFV]:
     """
     Get all documents of specific type with all custom field values
diff --git a/papermerge/core/types.py b/papermerge/core/types.py
index 593750a54..1c33913e6 100644
--- a/papermerge/core/types.py
+++ b/papermerge/core/types.py
@@ -36,3 +36,8 @@ class TokenData(BaseModel):
 
 CFValueType: TypeAlias = str | int | date | bool | float | None
 CFNameType: TypeAlias = str
+
+
+class OrderEnum(str, Enum):
+    asc = "asc"
+    desc = "desc"
diff --git a/tests/core/models/test_document.py b/tests/core/models/test_document.py
index 0ce1ad0a4..45f4b545e 100644
--- a/tests/core/models/test_document.py
+++ b/tests/core/models/test_document.py
@@ -17,6 +17,7 @@
 from papermerge.core.db.models import CustomField, CustomFieldValue
 from papermerge.core.models import Document, User
 from papermerge.core.storage import abs_path
+from papermerge.core.types import OrderEnum
 from papermerge.test import TestCase
 from papermerge.test.baker_recipes import document_recipe, folder_recipe, user_recipe
 from papermerge.test.utils import breadcrumb_fmt
@@ -659,7 +660,7 @@ def test_get_docs_by_type_order_by_cfv(db_session: Session, make_document_receip
         type_id=type_id,
         user_id=user_id,
         order_by="EffectiveDate",  # !!! EffectiveDate !!!
-        order="desc",  # !!! DESC !!!
+        order=OrderEnum.desc,  # !!! DESC !!!
     )
 
     assert len(items) == 3
@@ -683,7 +684,7 @@ def test_get_docs_by_type_order_by_cfv(db_session: Session, make_document_receip
         type_id=type_id,
         user_id=user_id,
         order_by="EffectiveDate",  #  !!! EffectiveDate !!!
-        order="asc",  # !!! ASC !!!
+        order=OrderEnum.asc,  # !!! ASC !!!
     )
 
     results_eff_date_asc = []
@@ -705,7 +706,7 @@ def test_get_docs_by_type_order_by_cfv(db_session: Session, make_document_receip
         type_id=type_id,
         user_id=user_id,
         order_by="Total",  #  !!! Total !!!
-        order="desc",  # !!! desc !!!
+        order=OrderEnum.desc,  # !!! desc !!!
     )
 
     results_total_desc = []
@@ -727,7 +728,7 @@ def test_get_docs_by_type_order_by_cfv(db_session: Session, make_document_receip
         type_id=type_id,
         user_id=user_id,
         order_by="Total",  #  !!! Total !!!
-        order="asc",  # !!! ASC !!!
+        order=OrderEnum.asc,  # !!! ASC !!!
     )
 
     results_total_asc = []