diff --git a/contrib/20.for/piclib/for.scm b/contrib/20.for/piclib/for.scm
index d37afd9f..3befa0ba 100644
--- a/contrib/20.for/piclib/for.scm
+++ b/contrib/20.for/piclib/for.scm
@@ -1,7 +1,6 @@
 (define-library (picrin control list)
   (import (scheme base)
-          (picrin control)
-          (scheme write))
+          (picrin control))
 
   (define-syntax for
     (syntax-rules ()