diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index c3f5029..d073be2 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -33,6 +33,8 @@
     void onUserStarted(int userId);
     void onUserStopped(int userId);
 
+    void onSecureKeyguardStateChanged(boolean isShowing);
+
     void partition(@utf8InCpp String diskId, int partitionType, int ratio);
     void forgetPartition(@utf8InCpp String partGuid, @utf8InCpp String fsUuid);