diff --git a/tsdb/agent/db_test.go b/tsdb/agent/db_test.go
index dc45c4197b..c0d600785c 100644
--- a/tsdb/agent/db_test.go
+++ b/tsdb/agent/db_test.go
@@ -1402,7 +1402,7 @@ func TestDuplicateSeriesRefsByHash(t *testing.T) {
 	}
 }
 
-func readWALSamples(t *testing.T, walDir string) []*walSample {
+func readWALSamples(t *testing.T, walDir string) []walSample {
 	t.Helper()
 	sr, err := wlog.NewSegmentsReader(walDir)
 	require.NoError(t, err)