diff --git a/sqladmin/forms.py b/sqladmin/forms.py
index 89e78ad0..f59d33ee 100644
--- a/sqladmin/forms.py
+++ b/sqladmin/forms.py
@@ -24,6 +24,7 @@
     RelationshipProperty,
     sessionmaker,
 )
+from sqlalchemy.sql import Select
 from sqlalchemy.sql.elements import Label
 from sqlalchemy.sql.schema import Column
 from wtforms import (
@@ -110,7 +111,7 @@ def _inner(func: T_CC) -> T_CC:
 
 
 class ModelConverterBase:
-    relationships_statements: dict[str, Any] = {}
+    relationships_statements: dict[str, Select] = {}
     """
     Select statement for relationships.
     """