diff --git a/ChangeLog b/ChangeLog
index 152c58f5fa..66bdc84bd3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jun 18 20:07:23 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* dir.c (dir_initialize): get rid of "unused return: argc = rb_scan_args()"
+	  warning.
+
 Mon Jun 18 19:31:20 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* include/ruby/missing.h: include math.h before checking INFINITY
diff --git a/dir.c b/dir.c
index ded9560528..8026fb7f19 100644
--- a/dir.c
+++ b/dir.c
@@ -396,7 +396,7 @@ dir_initialize(int argc, VALUE *argv, VALUE dir)
     }
     fsenc = rb_filesystem_encoding();
 
-    argc = rb_scan_args(argc, argv, "1:", &dirname, &opt);
+    rb_scan_args(argc, argv, "1:", &dirname, &opt);
 
     if (!NIL_P(opt)) {
 	VALUE enc = rb_hash_aref(opt, sym_enc);