diff --git a/contrib/03.callcc/callcc.c b/contrib/03.callcc/callcc.c
index 21594630..e366b8e0 100644
--- a/contrib/03.callcc/callcc.c
+++ b/contrib/03.callcc/callcc.c
@@ -214,7 +214,7 @@ cont_call(pic_state *pic)
   proc = pic_get_proc(pic);
   pic_get_args(pic, "*", &argc, &argv);
 
-  cont = pic_data_ptr(pic_attr_ref(pic, proc, "@@cont"))->data;
+  cont = pic_data_ptr(pic_attr_ref(pic, pic_obj_value(proc), "@@cont"))->data;
   cont->results = pic_list_by_array(pic, argc, argv);
 
   /* execute guard handlers */
@@ -241,7 +241,7 @@ pic_callcc(pic_state *pic, struct pic_proc *proc)
     dat = pic_data_alloc(pic, &cont_type, cont);
 
     /* save the continuation object in proc */
-    pic_attr_set(pic, c, "@@cont", pic_obj_value(dat));
+    pic_attr_set(pic, pic_obj_value(c), "@@cont", pic_obj_value(dat));
 
     return pic_apply1(pic, proc, pic_obj_value(c));
   }
@@ -265,7 +265,7 @@ pic_callcc_trampoline(pic_state *pic, struct pic_proc *proc)
     dat = pic_data_alloc(pic, &cont_type, cont);
 
     /* save the continuation object in proc */
-    pic_attr_set(pic, c, "@@cont", pic_obj_value(dat));
+    pic_attr_set(pic, pic_obj_value(c), "@@cont", pic_obj_value(dat));
 
     return pic_apply_trampoline(pic, proc, pic_list1(pic, pic_obj_value(c)));
   }
diff --git a/extlib/benz b/extlib/benz
index 6fc8341f..d33a98cd 160000
--- a/extlib/benz
+++ b/extlib/benz
@@ -1 +1 @@
-Subproject commit 6fc8341f50fef9e3be0763e3a61f0f44a3e6b502
+Subproject commit d33a98cd412f41005e0aa9ef99aa7d37ea7ff806