diff --git a/include/cyclone/types.h b/include/cyclone/types.h
index 4a53f090..49e0cf80 100644
--- a/include/cyclone/types.h
+++ b/include/cyclone/types.h
@@ -431,6 +431,10 @@ void gc_mutator_thread_runnable(gc_thread_data *thd, object result);
   gc_mutator_thread_blocked(((gc_thread_data *)d), (c))
 #define return_thread_runnable(d, r) \
   gc_mutator_thread_runnable(((gc_thread_data *)d), (r))
+//#define do_with_blocked_thread(data, cont, result, body) \
+//  set_thread_blocked((data), (cont)); \
+//  body \
+//  return_thread_runnable((data), (result));
 gc_heap *gc_get_heap();
 int gc_minor(void *data, object low_limit, object high_limit, closure cont, object *args, int num_args);
 /* Mutation table to support minor GC write barrier */