diff --git a/ChangeLog b/ChangeLog
index d4fde5e1cd..476554f977 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Feb 20 13:41:35 2002  Usaku Nakamura <usa@ruby-lang.org>
+
+	* io.c (rb_io_close): return Qnil.
+
 Wed Feb 20 12:41:59 2002  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* hash.c (rb_any_cmp): should handle Qundef in keys.
diff --git a/io.c b/io.c
index 78c2ef9750..ad896ad139 100644
--- a/io.c
+++ b/io.c
@@ -1166,7 +1166,7 @@ rb_io_close(io)
 
     fptr = RFILE(io)->fptr;
     if (!fptr) return Qnil;
-    if (!fptr->f && !fptr->f2) return;
+    if (!fptr->f && !fptr->f2) return Qnil;
 
     fd = fileno(fptr->f);
     rb_io_fptr_cleanup(fptr, Qfalse);