diff --git a/include/picrin/proc.h b/include/picrin/proc.h
index 89d06163..bc9b0db2 100644
--- a/include/picrin/proc.h
+++ b/include/picrin/proc.h
@@ -30,7 +30,7 @@ struct pic_proc *pic_proc_new(pic_state *, pic_func_t);
 struct pic_proc *pic_proc_new_irep(pic_state *, struct pic_irep *, struct pic_env *);
 
 /* closed variables accessor */
-void pic_proc_cv_reserve(pic_state *, struct pic_proc *, size_t);
+void pic_proc_cv_init(pic_state *, struct pic_proc *, size_t);
 int pic_proc_cv_size(pic_state *, struct pic_proc *);
 pic_value pic_proc_cv_ref(pic_state *, struct pic_proc *, size_t);
 void pic_proc_cv_set(pic_state *, struct pic_proc *, size_t, pic_value);
diff --git a/src/cont.c b/src/cont.c
index ec5d311c..7c1aa111 100644
--- a/src/cont.c
+++ b/src/cont.c
@@ -164,7 +164,7 @@ pic_cont_callcc(pic_state *pic)
     c = pic_proc_new(pic, cont_call);
 
     /* save the continuation object in proc */
-    pic_proc_cv_reserve(pic, c, 1);
+    pic_proc_cv_init(pic, c, 1);
     pic_proc_cv_set(pic, c, 0, pic_obj_value(cont));
 
     return pic_apply_argv(pic, cb, 1, pic_obj_value(c));
diff --git a/src/macro.c b/src/macro.c
index fdd2b7b4..0f8b97da 100644
--- a/src/macro.c
+++ b/src/macro.c
@@ -732,12 +732,12 @@ er_macro_call(pic_state *pic)
   }
 
   rename = pic_proc_new(pic, er_macro_rename);
-  pic_proc_cv_reserve(pic, rename, 2);
+  pic_proc_cv_init(pic, rename, 2);
   pic_proc_cv_set(pic, rename, 0, use_env);
   pic_proc_cv_set(pic, rename, 1, mac_env);
 
   compare = pic_proc_new(pic, er_macro_compare);
-  pic_proc_cv_reserve(pic, compare, 2);
+  pic_proc_cv_init(pic, compare, 2);
   pic_proc_cv_set(pic, compare, 0, use_env);
   pic_proc_cv_set(pic, compare, 1, mac_env);
 
@@ -754,7 +754,7 @@ pic_macro_er_macro_transformer(pic_state *pic)
   pic_get_args(pic, "l", &cb);
 
   proc = pic_proc_new(pic, er_macro_call);
-  pic_proc_cv_reserve(pic, proc, 1);
+  pic_proc_cv_init(pic, proc, 1);
   pic_proc_cv_set(pic, proc, 0, pic_obj_value(cb));
 
   return pic_obj_value(proc);
diff --git a/src/proc.c b/src/proc.c
index 6f772de8..f40cf0d8 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -28,7 +28,7 @@ pic_proc_new_irep(pic_state *pic, struct pic_irep *irep, struct pic_env *env)
 }
 
 void
-pic_proc_cv_reserve(pic_state *pic, struct pic_proc *proc, size_t cv_size)
+pic_proc_cv_init(pic_state *pic, struct pic_proc *proc, size_t cv_size)
 {
   struct pic_env *env;
 
diff --git a/src/var.c b/src/var.c
index e2cf9832..80e61f76 100644
--- a/src/var.c
+++ b/src/var.c
@@ -78,7 +78,7 @@ pic_var_make_parameter(pic_state *pic)
   var = pic_var_new(pic, init, conv);
 
   proc = pic_proc_new(pic, var_call);
-  pic_proc_cv_reserve(pic, proc, 1);
+  pic_proc_cv_init(pic, proc, 1);
   pic_proc_cv_set(pic, proc, 0, pic_obj_value(var));
 
   return pic_obj_value(proc);