diff --git a/aidl.h b/aidl.h
index 2e5b0ee..eb260c0 100644
--- a/aidl.h
+++ b/aidl.h
@@ -58,6 +58,7 @@
     const std::vector<std::string>& preprocessed_files,
     const std::vector<std::string>& import_paths,
     const std::string& input_file_name,
+    const bool generate_traces,
     const IoDelegate& io_delegate,
     TypeNamespace* types,
     std::unique_ptr<AidlInterface>* returned_interface,