diff --git a/web/migrations/versions/f6a7b8c9d0e1_evotor_webhook_token_flow.py b/web/migrations/versions/f6a7b8c9d0e1_evotor_webhook_token_flow.py
index 3d31566..2d0b305 100644
--- a/web/migrations/versions/f6a7b8c9d0e1_evotor_webhook_token_flow.py
+++ b/web/migrations/versions/f6a7b8c9d0e1_evotor_webhook_token_flow.py
@@ -41,11 +41,13 @@ def upgrade() -> None:
         op.create_index('ix_evotor_connections_evotor_user_id',
             'evotor_connections', ['evotor_user_id'])
 
-    op.alter_column('evotor_connections', 'user_id', nullable=True)
+    op.alter_column('evotor_connections', 'user_id',
+        existing_type=sa.Integer(), nullable=True)
 
 
 def downgrade() -> None:
-    op.alter_column('evotor_connections', 'user_id', nullable=False)
+    op.alter_column('evotor_connections', 'user_id',
+        existing_type=sa.Integer(), nullable=False)
     op.drop_index('ix_evotor_connections_evotor_user_id', 'evotor_connections')
     op.drop_constraint('uq_evotor_connections_evotor_user_id', 'evotor_connections')
     op.drop_column('evotor_connections', 'evotor_user_id')