diff --git a/pkg/plugin/manager_test.go b/pkg/plugin/manager_test.go
index aeac4bb..e861bef 100644
--- a/pkg/plugin/manager_test.go
+++ b/pkg/plugin/manager_test.go
@@ -151,7 +151,6 @@ func (m *mockRouterProvider) New(ctx context.Context, config map[string]string)
 type mockMiddlewareProvider struct {
 	middleware func(http.Handler) http.Handler
 	err        error
-	errFunc    func() error
 }
 
 func (m *mockMiddlewareProvider) New(ctx context.Context, config map[string]string) (func(http.Handler) http.Handler, error) {