diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index f4458a8..27330fe 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -98,6 +98,7 @@
 
     boolean startCheckpoint(int retry);
     boolean needsCheckpoint();
+    boolean needsRollback();
     void abortChanges();
     boolean commitChanges();
     boolean prepareDriveForCheckpoint(@utf8InCpp String mountPoint);