diff --git a/chart/templates/_helpers.yaml b/chart/templates/_helpers.yaml
index df7b158cb97a7..98efc9f1b31cb 100644
--- a/chart/templates/_helpers.yaml
+++ b/chart/templates/_helpers.yaml
@@ -380,7 +380,7 @@ server_tls_key_file = /etc/pgbouncer/server.key
         directory = os.path.join(package_dir, 'migrations')
         config = Config(os.path.join(package_dir, 'alembic.ini'))
         config.set_main_option('script_location', directory)
-        config.set_main_option('sqlalchemy.url', settings.SQL_ALCHEMY_CONN)
+        config.set_main_option('sqlalchemy.url', settings.SQL_ALCHEMY_CONN.replace('%', '%%'))
         script_ = ScriptDirectory.from_config(config)
 
         timeout=60