1 files changed, 3 insertions, 0 deletions
diff --git a/gc.h b/gc.h
index 96d22a6e09..741945349d 100644
--- a/gc.h
+++ b/gc.h
@@ -87,7 +87,10 @@ int ruby_get_stack_grow_direction(volatile VALUE *addr);
 #pragma GCC visibility push(default)
 #endif
 
+/* exports for objspace module */
 size_t rb_objspace_data_type_memsize(VALUE obj);
+VALUE rb_objspace_reachable_objects_from(VALUE obj);
+
 void rb_objspace_each_objects(
     int (*callback)(void *start, void *end, size_t stride, void *data),
     void *data);