1 files changed, 1 insertions, 1 deletions
diff --git a/src/vm.c b/src/vm.c
index ad26d9b8c..e2b02a4ce 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -245,7 +245,7 @@ cipop(mrb_state *mrb)
 
   if (c->ci->env) {
     struct REnv *e = c->ci->env;
-    size_t len = (size_t)e->flags;
+    size_t len = (size_t)MRB_ENV_STACK_LEN(e);
     mrb_value *p = (mrb_value *)mrb_malloc(mrb, sizeof(mrb_value)*len);
 
     e->cioff = -1;