diff --git a/core/java/android/view/Window.java b/core/java/android/view/Window.java
index cbcc057811fd9..9436633c0c4b4 100644
--- a/core/java/android/view/Window.java
+++ b/core/java/android/view/Window.java
@@ -1090,6 +1090,7 @@ public abstract class Window {
      *
      * @hide
      */
+    @UnsupportedAppUsage
     public void addPrivateFlags(int flags) {
         setPrivateFlags(flags, flags);
     }