diff --git a/Android.mk b/Android.mk
index d3e1cf5..115f100 100644
--- a/Android.mk
+++ b/Android.mk
@@ -96,6 +96,7 @@
 	core/java/android/app/trust/ITrustManager.aidl \
 	core/java/android/app/trust/ITrustListener.aidl \
 	core/java/android/app/backup/IBackupManager.aidl \
+	core/java/android/app/backup/IBackupObserver.aidl \
 	core/java/android/app/backup/IFullBackupRestoreObserver.aidl \
 	core/java/android/app/backup/IRestoreObserver.aidl \
 	core/java/android/app/backup/IRestoreSession.aidl \