diff --git a/backend/app/alembic/versions/e8ee93526b37_add_is_deleted_column_in_assistant_table.py b/backend/app/alembic/versions/e8ee93526b37_add_is_deleted_column_in_assistant_table.py
index 5cea5342..76f71e6b 100644
--- a/backend/app/alembic/versions/e8ee93526b37_add_is_deleted_column_in_assistant_table.py
+++ b/backend/app/alembic/versions/e8ee93526b37_add_is_deleted_column_in_assistant_table.py
@@ -18,7 +18,8 @@
 
 def upgrade():
     op.add_column(
-        "openai_assistant", sa.Column("is_deleted", sa.Boolean(), nullable=False)
+        "openai_assistant",
+        sa.Column("is_deleted", sa.Boolean(), nullable=False, server_default="false"),
     )
     op.add_column(
         "openai_assistant", sa.Column("deleted_at", sa.DateTime(), nullable=True)