diff --git a/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/metrics/BigtableExporterUtils.java b/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/metrics/BigtableExporterUtils.java
index 21cab9a19d..797f7f1eca 100644
--- a/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/metrics/BigtableExporterUtils.java
+++ b/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/metrics/BigtableExporterUtils.java
@@ -111,9 +111,9 @@ static String getProjectId(PointData pointData) {
     return pointData.getAttributes().get(BIGTABLE_PROJECT_ID_KEY);
   }
 
+  // Returns a list of timeseries by project id
   static Map<String, List<TimeSeries>> convertToBigtableTimeSeries(
       List<MetricData> collection, String taskId) {
-    // List of timeseries by project id
     Map<String, List<TimeSeries>> allTimeSeries = new HashMap<>();
 
     for (MetricData metricData : collection) {
diff --git a/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/metrics/DefaultMetricsProviderTest.java b/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/metrics/DefaultMetricsProviderTest.java
index 8eea857159..05bbf6db02 100644
--- a/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/metrics/DefaultMetricsProviderTest.java
+++ b/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/metrics/DefaultMetricsProviderTest.java
@@ -15,10 +15,15 @@
  */
 package com.google.cloud.bigtable.data.v2.stub.metrics;
 
-import com.google.auth.oauth2.GoogleCredentials;
+import com.google.auth.Credentials;
 import com.google.cloud.NoCredentials;
+import com.google.common.collect.ImmutableMap;
 import io.opentelemetry.api.OpenTelemetry;
 import java.io.IOException;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
 import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -38,8 +43,7 @@ public void test() throws IOException {
     // different endpoint and credential should return a different instance
     OpenTelemetry otel3 = provider.getOpenTelemetry(null, null);
     // same endpoint, different credential, should return a different instance
-    OpenTelemetry otel4 =
-        provider.getOpenTelemetry("fake-endpoint:123", GoogleCredentials.getApplicationDefault());
+    OpenTelemetry otel4 = provider.getOpenTelemetry("fake-endpoint:123", new FakeCredentials());
     // everything is the same, should return the same instance
     OpenTelemetry otel5 =
         provider.getOpenTelemetry("fake-endpoint:123", NoCredentials.getInstance());
@@ -51,4 +55,29 @@ public void test() throws IOException {
 
     provider.toString();
   }
+
+  private static class FakeCredentials extends Credentials {
+    @Override
+    public String getAuthenticationType() {
+      return "fake";
+    }
+
+    @Override
+    public Map<String, List<String>> getRequestMetadata(URI uri) throws IOException {
+      return ImmutableMap.of("my-header", Arrays.asList("fake-credential"));
+    }
+
+    @Override
+    public boolean hasRequestMetadata() {
+      return true;
+    }
+
+    @Override
+    public boolean hasRequestMetadataOnly() {
+      return true;
+    }
+
+    @Override
+    public void refresh() throws IOException {}
+  }
 }