diff --git a/exporter/opentelemetry-exporter-otlp-proto-grpc/tests/test_otlp_metrics_exporter.py b/exporter/opentelemetry-exporter-otlp-proto-grpc/tests/test_otlp_metrics_exporter.py
index a273a6871fb..f88b6d7bcf9 100644
--- a/exporter/opentelemetry-exporter-otlp-proto-grpc/tests/test_otlp_metrics_exporter.py
+++ b/exporter/opentelemetry-exporter-otlp-proto-grpc/tests/test_otlp_metrics_exporter.py
@@ -981,6 +981,7 @@ def test_preferred_aggregation_override(self):
         )
 
         self.assertEqual(
+            # pylint: disable=protected-access
             exporter._preferred_aggregation[Histogram], histogram_aggregation
         )