diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index 04c01736431da..f3ba56a03aef9 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -5604,7 +5604,8 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
         @Override
         public ActivityTokens getTopActivityForTask(int taskId) {
             synchronized (mGlobalLock) {
-                final Task task = mRootWindowContainer.anyTaskForId(taskId);
+                final Task task = mRootWindowContainer.anyTaskForId(taskId,
+                        MATCH_ATTACHED_TASK_ONLY);
                 if (task == null) {
                     Slog.w(TAG, "getApplicationThreadForTopActivity failed:"
                             + " Requested task not found");