diff --git a/migrations/versions/740fe24a7712_add_misskey.py b/migrations/versions/740fe24a7712_add_misskey.py
index 3b16d6d..c1e95dc 100644
--- a/migrations/versions/740fe24a7712_add_misskey.py
+++ b/migrations/versions/740fe24a7712_add_misskey.py
@@ -46,3 +46,4 @@ def upgrade():
 def downgrade():
     op.drop_table('misskey_instances')
     op.drop_table('misskey_apps')
+    op.execute('DROP TYPE enum_protocol_misskey;')