diff --git a/packages/SystemUI/src/com/android/systemui/flags/Flags.java b/packages/SystemUI/src/com/android/systemui/flags/Flags.java
index 0ee53cd68dbe7..c162c20d5abf1 100644
--- a/packages/SystemUI/src/com/android/systemui/flags/Flags.java
+++ b/packages/SystemUI/src/com/android/systemui/flags/Flags.java
@@ -103,6 +103,10 @@ public class Flags {
      */
     public static final ReleasedFlag MODERN_BOUNCER = new ReleasedFlag(208);
 
+    /** Whether UserSwitcherActivity should use modern architecture. */
+    public static final UnreleasedFlag MODERN_USER_SWITCHER_ACTIVITY =
+            new UnreleasedFlag(209, true);
+
     /***************************************/
     // 300 - power menu
     public static final ReleasedFlag POWER_MENU_LITE =