diff --git a/pkg/metricscollector/v1beta1/file-metricscollector/file-metricscollector_test.go b/pkg/metricscollector/v1beta1/file-metricscollector/file-metricscollector_test.go
index 14e505f6ec4..7e8042ef66b 100644
--- a/pkg/metricscollector/v1beta1/file-metricscollector/file-metricscollector_test.go
+++ b/pkg/metricscollector/v1beta1/file-metricscollector/file-metricscollector_test.go
@@ -27,7 +27,6 @@ import (
 	commonv1beta1 "github.com/kubeflow/katib/pkg/apis/controller/common/v1beta1"
 	v1beta1 "github.com/kubeflow/katib/pkg/apis/manager/v1beta1"
 	"github.com/kubeflow/katib/pkg/controller.v1beta1/consts"
-	"google.golang.org/protobuf/testing/protocmp"
 )
 
 func TestCollectObservationLog(t *testing.T) {
@@ -321,7 +320,8 @@ invalid INFO     {metricName: loss, metricValue: 0.3634}`,
 			if diff := cmp.Diff(test.wantError, err, cmpopts.EquateErrors()); len(diff) != 0 {
 				t.Errorf("Unexpected error (-want,+got):\n%s", diff)
 			}
-			if diff := cmp.Diff(test.expected, actual, protocmp.Transform()); len(diff) != 0 {
+			observationLogCmpOpts := cmpopts.IgnoreUnexported(v1beta1.ObservationLog{}, v1beta1.MetricLog{}, v1beta1.Metric{})
+			if diff := cmp.Diff(test.expected, actual, observationLogCmpOpts); len(diff) != 0 {
 				t.Errorf("Unexpected parsed result (-want,+got):\n%s", diff)
 			}
 		})