diff --git a/extlib/benz/include/picrin.h b/extlib/benz/include/picrin.h
index 817fc03d..62fa27bd 100644
--- a/extlib/benz/include/picrin.h
+++ b/extlib/benz/include/picrin.h
@@ -192,7 +192,7 @@ void pic_defvar_(pic_state *, const char *, pic_value, struct pic_proc *);
 
 pic_value pic_ref(pic_state *, struct pic_lib *, const char *);
 void pic_set(pic_state *, struct pic_lib *, const char *, pic_value);
-pic_value pic_funcall(pic_state *pic, struct pic_lib *, const char *, pic_list);
+pic_value pic_funcall(pic_state *pic, struct pic_lib *, const char *, pic_value);
 pic_value pic_funcall0(pic_state *pic, struct pic_lib *, const char *);
 pic_value pic_funcall1(pic_state *pic, struct pic_lib *, const char *, pic_value);
 pic_value pic_funcall2(pic_state *pic, struct pic_lib *, const char *, pic_value, pic_value);
diff --git a/extlib/benz/include/picrin/error.h b/extlib/benz/include/picrin/error.h
index 2afd0f3a..ecf59dda 100644
--- a/extlib/benz/include/picrin/error.h
+++ b/extlib/benz/include/picrin/error.h
@@ -20,7 +20,7 @@ struct pic_error {
 #define pic_error_p(v) (pic_type(v) == PIC_TT_ERROR)
 #define pic_error_ptr(v) ((struct pic_error *)pic_ptr(v))
 
-struct pic_error *pic_make_error(pic_state *, pic_sym *, const char *, pic_list);
+struct pic_error *pic_make_error(pic_state *, pic_sym *, const char *, pic_value);
 
 /* do not return from try block! */
 
@@ -55,7 +55,7 @@ struct pic_proc *pic_pop_handler(pic_state *);
 
 pic_value pic_raise_continuable(pic_state *, pic_value);
 PIC_NORETURN void pic_raise(pic_state *, pic_value);
-PIC_NORETURN void pic_error(pic_state *, const char *, pic_list);
+PIC_NORETURN void pic_error(pic_state *, const char *, pic_value);
 
 #if defined(__cplusplus)
 }
diff --git a/extlib/benz/include/picrin/type.h b/extlib/benz/include/picrin/type.h
index 4de8d279..7865ffa5 100644
--- a/extlib/benz/include/picrin/type.h
+++ b/extlib/benz/include/picrin/type.h
@@ -182,7 +182,6 @@ struct pic_error;
 struct pic_env;
 
 /* set aliases to basic types */
-typedef pic_value pic_list;
 typedef struct pic_symbol pic_sym;
 typedef struct pic_pair pic_pair;
 typedef struct pic_string pic_str;
diff --git a/extlib/benz/vm.c b/extlib/benz/vm.c
index dda6de12..50023062 100644
--- a/extlib/benz/vm.c
+++ b/extlib/benz/vm.c
@@ -1182,7 +1182,7 @@ pic_set(pic_state *pic, struct pic_lib *lib, const char *name, pic_value val)
 }
 
 pic_value
-pic_funcall(pic_state *pic, struct pic_lib *lib, const char *name, pic_list args)
+pic_funcall(pic_state *pic, struct pic_lib *lib, const char *name, pic_value args)
 {
   pic_value proc;