diff --git a/compiler/image_writer.h b/compiler/image_writer.h
index 9371d9f..a4a252e 100644
--- a/compiler/image_writer.h
+++ b/compiler/image_writer.h
@@ -123,7 +123,7 @@
 
   // Update the oat size for the given oat file. This will make the oat_offset for the next oat
   // file valid.
-  void UpdateOatFile(File* oat_file, const char* oat_filename);
+  void UpdateOatFile(size_t index, size_t oat_loaded_size);
 
  private:
   bool AllocMemory();