diff --git a/include/mruby/error.h b/include/mruby/error.h
index d7abbb14c..1587795fc 100644
--- a/include/mruby/error.h
+++ b/include/mruby/error.h
@@ -34,7 +34,6 @@ MRB_API mrb_value mrb_f_raise(mrb_state*, mrb_value);
 
 struct RBreak {
   MRB_OBJECT_HEADER;
-  struct iv_tbl *iv;
   struct RProc *proc;
   mrb_value val;
 };
diff --git a/src/vm.c b/src/vm.c
index 170cb832d..2c2d74db1 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -810,7 +810,6 @@ break_new(mrb_state *mrb, struct RProc *p, mrb_value val)
   struct RBreak *brk;
 
   brk = (struct RBreak*)mrb_obj_alloc(mrb, MRB_TT_BREAK, NULL);
-  brk->iv = NULL;
   brk->proc = p;
   brk->val = val;