diff --git a/src/wrapper.h b/src/wrapper.h
index 41487ac..4cccc9d 100644
--- a/src/wrapper.h
+++ b/src/wrapper.h
@@ -2,8 +2,8 @@
 
 #include "rust/cxx.h"
 
-class RustStream;
-class RustHandler;
+struct RustStream;
+struct RustHandler;
 
 void parse(RustHandler & handler, RustStream & incoming);
 void from_file(rust::String filename, RustHandler & handler);