diff --git a/extlib/benz/include/picrin.h b/extlib/benz/include/picrin.h
index c5c54110..37b83f42 100644
--- a/extlib/benz/include/picrin.h
+++ b/extlib/benz/include/picrin.h
@@ -243,13 +243,6 @@ void pic_warnf(pic_state *, const char *, ...);
 const char *pic_errmsg(pic_state *);
 pic_str *pic_get_backtrace(pic_state *);
 void pic_print_backtrace(pic_state *, xFILE *);
-
-/* obsoleted */
-PIC_INLINE void pic_warn(pic_state *pic, const char *msg)
-{
-  pic_warnf(pic, msg);
-}
-
 struct pic_dict *pic_attr(pic_state *, pic_value);
 pic_value pic_attr_ref(pic_state *, pic_value, const char *);
 void pic_attr_set(pic_state *, pic_value, const char *, pic_value);
diff --git a/extlib/benz/vm.c b/extlib/benz/vm.c
index 995a6dac..ab9916fb 100644
--- a/extlib/benz/vm.c
+++ b/extlib/benz/vm.c
@@ -413,7 +413,7 @@ pic_define_noexport(pic_state *pic, const char *name, pic_value val)
   if (! pic_find_rename(pic, pic->lib->env, sym, &rename)) {
     rename = pic_add_rename(pic, pic->lib->env, sym);
   } else {
-    pic_warn(pic, "redefining global");
+    pic_warnf(pic, "redefining global");
   }
 
   pic_dict_set(pic, pic->globals, rename, val);