diff --git a/quickstep/tests/src/com/android/quickstep/TaplTestsPersistentTaskbar.java b/quickstep/tests/src/com/android/quickstep/TaplTestsPersistentTaskbar.java
index b165876895..a71d74a35a 100644
--- a/quickstep/tests/src/com/android/quickstep/TaplTestsPersistentTaskbar.java
+++ b/quickstep/tests/src/com/android/quickstep/TaplTestsPersistentTaskbar.java
@@ -15,6 +15,8 @@
  */
 package com.android.quickstep;
 
+import static com.android.launcher3.util.rule.TestStabilityRule.LOCAL;
+import static com.android.launcher3.util.rule.TestStabilityRule.PLATFORM_POSTSUBMIT;
 import static com.android.quickstep.TaskbarModeSwitchRule.Mode.PERSISTENT;
 
 import android.graphics.Rect;
@@ -24,6 +26,7 @@ import androidx.test.platform.app.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.launcher3.ui.PortraitLandscapeRunner.PortraitLandscape;
+import com.android.launcher3.util.rule.TestStabilityRule;
 import com.android.quickstep.NavigationModeSwitchRule.NavigationModeSwitch;
 import com.android.quickstep.TaskbarModeSwitchRule.TaskbarModeSwitch;
 
@@ -48,6 +51,7 @@ public class TaplTestsPersistentTaskbar extends AbstractTaplTestsTaskbar {
     }
 
     @Test
+    @TestStabilityRule.Stability(flavors = LOCAL | PLATFORM_POSTSUBMIT) // b/320490387
     @NavigationModeSwitch(mode = NavigationModeSwitchRule.Mode.THREE_BUTTON)
     public void testThreeButtonsTaskbarBoundsAfterConfigChangeDuringIme() {
         // Start off in light mode.