diff --git a/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java b/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java
index cffd9c85df..eb68404bb3 100644
--- a/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java
+++ b/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java
@@ -329,7 +329,9 @@ public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProvi
             Duration.ofSeconds(10)) // wait this long before considering the connection dead
         // Attempts direct access to CBT service over gRPC to improve throughput,
         // whether the attempt is allowed is totally controlled by service owner.
-        .setAttemptDirectPath(true);
+        .setAttemptDirectPath(true)
+        // Allow using non-default service account in DirectPath.
+        .setAllowNonDefaultServiceAccount(true);
   }
 
   @SuppressWarnings("WeakerAccess")