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 4415894132..46933c1690 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
@@ -370,7 +370,11 @@ public static InstantiatingGrpcChannelProvider.Builder defaultGrpcTransportProvi
     if (isDirectpathEnabled) {
       // Attempts direct access to CBT service over gRPC to improve throughput,
       // whether the attempt is allowed is totally controlled by service owner.
-      grpcTransportProviderBuilder.setAttemptDirectPathXds().setAttemptDirectPath(true);
+      grpcTransportProviderBuilder
+          .setAttemptDirectPathXds()
+          .setAttemptDirectPath(true)
+          // Allow using non-default service account in DirectPath.
+          .setAllowNonDefaultServiceAccount(true);
     }
     return grpcTransportProviderBuilder
         .setChannelPoolSettings(