diff --git a/core/java/android/hardware/input/InputManager.java b/core/java/android/hardware/input/InputManager.java
index 81ea2f5a17dde..4c6644d14e0e6 100644
--- a/core/java/android/hardware/input/InputManager.java
+++ b/core/java/android/hardware/input/InputManager.java
@@ -209,6 +209,14 @@ public final class InputManager {
     @ChangeId
     public static final long BLOCK_UNTRUSTED_TOUCHES = 158002302L;
 
+    /**
+     * Check whether apps are using FLAG_SLIPPERY for their windows. We expect that this flag is
+     * only used by the system components. If so, we can lock it down.
+     * @hide
+     */
+    @ChangeId
+    public static final long BLOCK_FLAG_SLIPPERY = android.os.IInputConstants.BLOCK_FLAG_SLIPPERY;
+
     /**
      * Input Event Injection Synchronization Mode: None.
      * Never blocks.  Injection is asynchronous and is assumed always to be successful.