diff --git a/services/backup/java/com/android/server/backup/BackupManagerService.java b/services/backup/java/com/android/server/backup/BackupManagerService.java
index 88c05b55116b8..3adf0f45dffc5 100644
--- a/services/backup/java/com/android/server/backup/BackupManagerService.java
+++ b/services/backup/java/com/android/server/backup/BackupManagerService.java
@@ -9573,7 +9573,14 @@ if (MORE_DEBUG) Slog.v(TAG, "   + got " + nRead + "; now wanting " + (size - soF
 
     public String[] getTransportWhitelist() {
         // No permission check, intentionally.
-        return mTransportManager.getTransportWhitelist().toArray(new String[0]);
+        Set<ComponentName> whitelistedComponents = mTransportManager.getTransportWhitelist();
+        String[] whitelistedTransports = new String[whitelistedComponents.size()];
+        int i = 0;
+        for (ComponentName component : whitelistedComponents) {
+            whitelistedTransports[i] = component.flattenToShortString();
+            i++;
+        }
+        return whitelistedTransports;
     }
 
     // Select which transport to use for the next backup operation.
diff --git a/services/backup/java/com/android/server/backup/TransportManager.java b/services/backup/java/com/android/server/backup/TransportManager.java
index 93d5a1ea8880b..b9dbe13af7c8c 100644
--- a/services/backup/java/com/android/server/backup/TransportManager.java
+++ b/services/backup/java/com/android/server/backup/TransportManager.java
@@ -31,6 +31,7 @@ import android.os.IBinder;
 import android.os.RemoteException;
 import android.os.UserHandle;
 import android.util.ArrayMap;
+import android.util.ArraySet;
 import android.util.EventLog;
 import android.util.Log;
 import android.util.Slog;
@@ -84,7 +85,7 @@ class TransportManager {
             TransportBoundListener listener) {
         mContext = context;
         mPackageManager = context.getPackageManager();
-        mTransportWhitelist = whitelist;
+        mTransportWhitelist = (whitelist != null) ? whitelist : new ArraySet<>();
         mCurrentTransportName = defaultTransport;
         mTransportBoundListener = listener;
     }