diff --git a/pkg/util/push/push_test.go b/pkg/util/push/push_test.go
index c31a769433f..178f2346c91 100644
--- a/pkg/util/push/push_test.go
+++ b/pkg/util/push/push_test.go
@@ -259,11 +259,13 @@ func createCortexRemoteWriteV2Protobuf(t *testing.T, skipLabelNameValidation boo
 	t.Helper()
 	input := cortexpbv2.WriteRequest{
 		Symbols: []string{"", "__name__", "foo"},
-		Timeseries: []cortexpbv2.TimeSeries{
+		Timeseries: []cortexpbv2.PreallocTimeseriesV2{
 			{
-				LabelsRefs: []uint32{1, 2},
-				Samples: []cortexpbv2.Sample{
-					{Value: 1, Timestamp: time.Date(2020, 4, 1, 0, 0, 0, 0, time.UTC).UnixNano()},
+				TimeSeries: &cortexpbv2.TimeSeries{
+					LabelsRefs: []uint32{1, 2},
+					Samples: []cortexpbv2.Sample{
+						{Value: 1, Timestamp: time.Date(2020, 4, 1, 0, 0, 0, 0, time.UTC).UnixNano()},
+					},
 				},
 			},
 		},