diff --git a/libs/androidfw/BackupHelpers.cpp b/libs/androidfw/BackupHelpers.cpp
index 8bfe2b6..e80e948 100644
--- a/libs/androidfw/BackupHelpers.cpp
+++ b/libs/androidfw/BackupHelpers.cpp
@@ -479,7 +479,7 @@
 }
 
 int write_tarfile(const String8& packageName, const String8& domain,
-        const String8& rootpath, const String8& filepath, off_t* outSize,
+        const String8& rootpath, const String8& filepath, off64_t* outSize,
         BackupDataWriter* writer)
 {
     // In the output stream everything is stored relative to the root