diff --git a/libs/utils/Android.mk b/libs/utils/Android.mk
index cdb8ca2..f9fb780 100644
--- a/libs/utils/Android.mk
+++ b/libs/utils/Android.mk
@@ -116,7 +116,8 @@
 	ProcessState.cpp \
 	IPermissionController.cpp \
 	IServiceManager.cpp \
-	Unicode.cpp
+	Unicode.cpp \
+	file_backup_helper.cpp
 
 ifeq ($(TARGET_SIMULATOR),true)
 LOCAL_SRC_FILES += $(hostSources)