diff --git a/pkg/plugin/manager.go b/pkg/plugin/manager.go
index c3bbfe9..12d5909 100644
--- a/pkg/plugin/manager.go
+++ b/pkg/plugin/manager.go
@@ -159,7 +159,7 @@ func (m *Manager) SchemaValidator(ctx context.Context, cfg *Config) (definition.
 		return nil, err
 	}
 	if closer != nil {
-		m.addCloser(func() {
+		m.closers = append(m.closers, func() {
 			if err := closer(); err != nil {
 				panic(err)
 			}