diff --git a/src/gc.c b/src/gc.c
index 56d316b0d..dd63395bd 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -1483,6 +1483,7 @@ gc_each_objects(mrb_state *mrb, mrb_gc *gc, mrb_each_object_callback *callback,
 {
   mrb_heap_page* page;
 
+  mrb_full_gc(mrb);
   page = gc->heaps;
   while (page != NULL) {
     RVALUE *p;