diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java
index f001483ea..d1b0f5802 100644
--- a/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java
+++ b/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java
@@ -211,6 +211,7 @@ private Tuple<StorageSettings, Opts<UserProject>> resolveSettingsAndOpts() throw
     InstantiatingGrpcChannelProvider.Builder channelProviderBuilder =
         InstantiatingGrpcChannelProvider.newBuilder()
             .setEndpoint(endpoint)
+            .setAllowNonDefaultServiceAccount(true)
             .setAttemptDirectPath(attemptDirectPath);
 
     if (scheme.equals("http")) {