diff --git a/discovery/manager_test.go b/discovery/manager_test.go
index fce8ec0a52..2e8e4558f6 100644
--- a/discovery/manager_test.go
+++ b/discovery/manager_test.go
@@ -1653,7 +1653,7 @@ func TestGaugeLastUpdateTimestamp(t *testing.T) {
 	ctx := t.Context()
 
 	reg := prometheus.NewRegistry()
-	_, sdMetrics := NewTestMetrics(t, reg)
+	sdMetrics := NewTestMetrics(t, reg)
 
 	discoveryManager := NewManager(ctx, promslog.NewNopLogger(), reg, sdMetrics)
 	require.NotNil(t, discoveryManager)