diff --git a/api/migrations/versions/2026_02_26_1336-e288952f2994_add_partial_indexes_on_conversations_.py b/api/migrations/versions/2026_02_26_1336-e288952f2994_add_partial_indexes_on_conversations_.py
index 5104e274f7..713f226b20 100644
--- a/api/migrations/versions/2026_02_26_1336-e288952f2994_add_partial_indexes_on_conversations_.py
+++ b/api/migrations/versions/2026_02_26_1336-e288952f2994_add_partial_indexes_on_conversations_.py
@@ -21,17 +21,17 @@ def upgrade():
             'conversation_app_created_at_idx',
             ['app_id', sa.literal_column('created_at DESC')],
             unique=False,
-            postgresql_where=sa.text('is_deleted = false'),
+            postgresql_where=sa.text('is_deleted IS false'),
         )
         batch_op.create_index(
             'conversation_app_updated_at_idx',
             ['app_id', sa.literal_column('updated_at DESC')],
             unique=False,
-            postgresql_where=sa.text('is_deleted = false'),
+            postgresql_where=sa.text('is_deleted IS false'),
         )
 
 
 def downgrade():
     with op.batch_alter_table('conversations', schema=None) as batch_op:
-        batch_op.drop_index('conversation_app_updated_at_idx', postgresql_where=sa.text('is_deleted = false'))
-        batch_op.drop_index('conversation_app_created_at_idx', postgresql_where=sa.text('is_deleted = false'))
+        batch_op.drop_index('conversation_app_updated_at_idx', postgresql_where=sa.text('is_deleted IS false'))
+        batch_op.drop_index('conversation_app_created_at_idx', postgresql_where=sa.text('is_deleted IS false'))
diff --git a/api/models/model.py b/api/models/model.py
index fd0cfc2e5f..54b03bf421 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -715,13 +715,13 @@ class Conversation(Base):
             "conversation_app_created_at_idx",
             "app_id",
             sa.text("created_at DESC"),
-            postgresql_where=sa.text("is_deleted = false"),
+            postgresql_where=sa.text("is_deleted IS false"),
         ),
         sa.Index(
             "conversation_app_updated_at_idx",
             "app_id",
             sa.text("updated_at DESC"),
-            postgresql_where=sa.text("is_deleted = false"),
+            postgresql_where=sa.text("is_deleted IS false"),
         ),
     )