diff --git a/services/core/java/com/android/server/am/RecentTasks.java b/services/core/java/com/android/server/am/RecentTasks.java
index 1335ced6182e8..efd8153832004 100644
--- a/services/core/java/com/android/server/am/RecentTasks.java
+++ b/services/core/java/com/android/server/am/RecentTasks.java
@@ -1243,15 +1243,13 @@ class RecentTasks {
      */
     private int findRemoveIndexForAddTask(TaskRecord task) {
         final int recentsCount = mTasks.size();
-        final int taskActivityType = task.getActivityType();
         final Intent intent = task.intent;
         final boolean document = intent != null && intent.isDocument();
         int maxRecents = task.maxRecents - 1;
         for (int i = 0; i < recentsCount; i++) {
             final TaskRecord tr = mTasks.get(i);
-            final int trActivityType = tr.getActivityType();
             if (task != tr) {
-                if (taskActivityType != trActivityType || task.userId != tr.userId) {
+                if (!task.hasCompatibleActivityType(tr)) {
                     continue;
                 }
                 final Intent trIntent = tr.intent;
diff --git a/services/tests/servicestests/src/com/android/server/am/RecentTasksTest.java b/services/tests/servicestests/src/com/android/server/am/RecentTasksTest.java
index 376f5b1937164..77653872e5ee8 100644
--- a/services/tests/servicestests/src/com/android/server/am/RecentTasksTest.java
+++ b/services/tests/servicestests/src/com/android/server/am/RecentTasksTest.java
@@ -42,11 +42,13 @@ import static java.lang.Integer.MAX_VALUE;
 import android.app.ActivityManager;
 import android.app.ActivityManager.RecentTaskInfo;
 import android.app.ActivityManager.RunningTaskInfo;
+import android.app.WindowConfiguration;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.content.pm.ParceledListSlice;
 import android.content.pm.UserInfo;
+import android.content.res.Configuration;
 import android.graphics.Rect;
 import android.os.Bundle;
 import android.os.Debug;
@@ -101,8 +103,8 @@ public class RecentTasksTest extends ActivityTestsBase {
     private TestRecentTasks mRecentTasks;
     private TestRunningTasks mRunningTasks;
 
-    private static ArrayList<TaskRecord> mTasks = new ArrayList<>();
-    private static ArrayList<TaskRecord> mSameDocumentTasks = new ArrayList<>();
+    private ArrayList<TaskRecord> mTasks;
+    private ArrayList<TaskRecord> mSameDocumentTasks;
 
     private CallbacksRecorder mCallbacksRecorder;
 
@@ -155,12 +157,14 @@ public class RecentTasksTest extends ActivityTestsBase {
         mRecentTasks.registerCallback(mCallbacksRecorder);
         QUIET_USER_INFO.flags = UserInfo.FLAG_MANAGED_PROFILE | UserInfo.FLAG_QUIET_MODE;
 
+        mTasks = new ArrayList<>();
         mTasks.add(createTaskBuilder(".Task1").build());
         mTasks.add(createTaskBuilder(".Task2").build());
         mTasks.add(createTaskBuilder(".Task3").build());
         mTasks.add(createTaskBuilder(".Task4").build());
         mTasks.add(createTaskBuilder(".Task5").build());
 
+        mSameDocumentTasks = new ArrayList<>();
         mSameDocumentTasks.add(createDocumentTask(".DocumentTask1"));
         mSameDocumentTasks.add(createDocumentTask(".DocumentTask1"));
     }
@@ -294,7 +298,32 @@ public class RecentTasksTest extends ActivityTestsBase {
         assertTrue(mCallbacksRecorder.added.contains(task2));
         assertTrue(mCallbacksRecorder.trimmed.isEmpty());
         assertTrue(mCallbacksRecorder.removed.isEmpty());
+    }
 
+    @Test
+    public void testAddTaskCompatibleActivityType_expectRemove() throws Exception {
+        Configuration config1 = new Configuration();
+        config1.windowConfiguration.setActivityType(ACTIVITY_TYPE_UNDEFINED);
+        TaskRecord task1 = createTaskBuilder(".Task1")
+                .setFlags(FLAG_ACTIVITY_NEW_TASK)
+                .setStack(mStack)
+                .build();
+        task1.onConfigurationChanged(config1);
+        assertTrue(task1.getActivityType() == ACTIVITY_TYPE_UNDEFINED);
+        mRecentTasks.add(task1);
+        mCallbacksRecorder.clear();
+
+        TaskRecord task2 = createTaskBuilder(".Task1")
+                .setFlags(FLAG_ACTIVITY_NEW_TASK)
+                .setStack(mStack)
+                .build();
+        assertTrue(task2.getActivityType() == ACTIVITY_TYPE_STANDARD);
+        mRecentTasks.add(task2);
+        assertTrue(mCallbacksRecorder.added.size() == 1);
+        assertTrue(mCallbacksRecorder.added.contains(task2));
+        assertTrue(mCallbacksRecorder.trimmed.isEmpty());
+        assertTrue(mCallbacksRecorder.removed.size() == 1);
+        assertTrue(mCallbacksRecorder.removed.contains(task1));
     }
 
     @Test
diff --git a/services/tests/servicestests/src/com/android/server/am/TaskPersisterTest.java b/services/tests/servicestests/src/com/android/server/am/TaskPersisterTest.java
index ea207f1f19101..9e6055d55e0f1 100644
--- a/services/tests/servicestests/src/com/android/server/am/TaskPersisterTest.java
+++ b/services/tests/servicestests/src/com/android/server/am/TaskPersisterTest.java
@@ -29,6 +29,9 @@ import com.android.server.am.TaskPersister;
 import java.io.File;
 import java.util.Random;
 
+/**
+ * atest FrameworksServicesTests:TaskPersisterTest
+ */
 public class TaskPersisterTest extends AndroidTestCase {
     private static final String TEST_USER_NAME = "AM-Test-User";