diff --git a/piclib/built-in.scm b/piclib/built-in.scm
index 9f524fa6..da9f3974 100644
--- a/piclib/built-in.scm
+++ b/piclib/built-in.scm
@@ -1,10 +1,3 @@
-; Although looking like a magic, it just works.
-(define (car x)
-  (car x))
-
-(define (cdr x)
-  (cdr x))
-
 (define (zero? n)
   (= n 0))
 
@@ -138,9 +131,6 @@
 	  (every pred (cdr list))
 	  #f)))
 
-(define (null? obj)
-  (null? obj))
-
 (define (any pred list)
   (if (null? list)
       #f
diff --git a/src/pair.c b/src/pair.c
index 922a73bb..6d96fcb6 100644
--- a/src/pair.c
+++ b/src/pair.c
@@ -125,6 +125,46 @@ pic_pair_pair_p(pic_state *pic)
   return pic_bool_value(pic_pair_p(v));
 }
 
+static pic_value
+pic_pair_car(pic_state *pic)
+{
+  pic_value v;
+
+  pic_get_args(pic, "o", &v);
+
+  return pic_car(pic, v);
+}
+
+static pic_value
+pic_pair_cdr(pic_state *pic)
+{
+  pic_value v;
+
+  pic_get_args(pic, "o", &v);
+
+  return pic_cdr(pic, v);
+}
+
+static pic_value
+pic_pair_null_p(pic_state *pic)
+{
+  pic_value v;
+
+  pic_get_args(pic, "o", &v);
+
+  return pic_bool_value(pic_nil_p(v));
+}
+
+static pic_value
+pic_pair_cons(pic_state *pic)
+{
+  pic_value v,w;
+
+  pic_get_args(pic, "oo", &v, &w);
+
+  return pic_cons(pic, v, w);
+}
+
 static pic_value
 pic_pair_set_car(pic_state *pic)
 {
@@ -157,6 +197,10 @@ void
 pic_init_pair(pic_state *pic)
 {
   pic_defun(pic, "pair?", pic_pair_pair_p);
+  pic_defun(pic, "car", pic_pair_car);
+  pic_defun(pic, "cdr", pic_pair_cdr);
+  pic_defun(pic, "null?", pic_pair_null_p);
+  pic_defun(pic, "cons", pic_pair_cons);
   pic_defun(pic, "set-car!", pic_pair_set_car);
   pic_defun(pic, "set-cdr!", pic_pair_set_cdr);
 }