diff --git a/cont.c b/cont.c
index 563332aa..53ec911d 100644
--- a/cont.c
+++ b/cont.c
@@ -205,19 +205,19 @@ restore_cont(pic_state *pic, struct pic_cont *cont)
   longjmp(tmp->jmp, 1);
 }
 
-void
-pic_wind(pic_state *pic, struct pic_winder *here, struct pic_winder *there)
+static void
+do_wind(pic_state *pic, struct pic_winder *here, struct pic_winder *there)
 {
   if (here == there)
     return;
 
   if (here->depth < there->depth) {
-    pic_wind(pic, here, there->prev);
+    do_wind(pic, here, there->prev);
     pic_apply0(pic, there->in);
   }
   else {
     pic_apply0(pic, there->out);
-    pic_wind(pic, here->prev, there);
+    do_wind(pic, here->prev, there);
   }
 }
 
@@ -264,7 +264,7 @@ cont_call(pic_state *pic)
   cont->results = pic_list_by_array(pic, argc, argv);
 
   /* execute guard handlers */
-  pic_wind(pic, pic->wind, cont->wind);
+  do_wind(pic, pic->wind, cont->wind);
 
   restore_cont(pic, cont);
 }
diff --git a/include/picrin/cont.h b/include/picrin/cont.h
index 503651f1..e30981c7 100644
--- a/include/picrin/cont.h
+++ b/include/picrin/cont.h
@@ -47,7 +47,6 @@ pic_value pic_values_by_list(pic_state *, pic_value);
 size_t pic_receive(pic_state *, size_t, pic_value *);
 
 pic_value pic_callcc(pic_state *, struct pic_proc *);
-void pic_wind(pic_state *, struct pic_winder *, struct pic_winder *);
 
 #if defined(__cplusplus)
 }