diff --git a/ChangeLog b/ChangeLog
index 794314b996..5ae2d094bb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Dec 19 04:21:10 2002  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/open-uri.rb: add a missing ||. (found by: ruby -wc)
+
 Wed Dec 18 03:52:55 2002  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* string.c (rb_str_new4): handle tail shared string.
diff --git a/lib/open-uri.rb b/lib/open-uri.rb
index 54afb4d88b..2a72062574 100644
--- a/lib/open-uri.rb
+++ b/lib/open-uri.rb
@@ -82,7 +82,7 @@ module OpenURI
     end
 
     unless mode == nil ||
-           mode == 'r' || mode == 'rb'
+           mode == 'r' || mode == 'rb' ||
            mode == O_RDONLY
       raise ArgumentError.new("invalid access mode #{mode} (#{uri.class} resource is read only.)")
     end