diff --git a/ChangeLog b/ChangeLog
index 3037125879..c2eb11c3ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jan 26 15:49:42 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/pathname.rb (chop_basename, prepend_prefix): use o option.
+
 Sun Jan 25 16:35:44 2009  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/socket.c (socket_s_ip_address_list): renamed from
diff --git a/lib/pathname.rb b/lib/pathname.rb
index 86f0f54800..2b25ca957d 100644
--- a/lib/pathname.rb
+++ b/lib/pathname.rb
@@ -274,7 +274,7 @@ class Pathname
   # chop_basename(path) -> [pre-basename, basename] or nil
   def chop_basename(path)
     base = File.basename(path)
-    if /\A#{SEPARATOR_PAT}?\z/ =~ base
+    if /\A#{SEPARATOR_PAT}?\z/o =~ base
       return nil
     else
       return path[0, path.rindex(base)], base
@@ -296,7 +296,7 @@ class Pathname
   def prepend_prefix(prefix, relpath)
     if relpath.empty?
       File.dirname(prefix)
-    elsif /#{SEPARATOR_PAT}/ =~ prefix
+    elsif /#{SEPARATOR_PAT}/o =~ prefix
       prefix = File.dirname(prefix)
       prefix = File.join(prefix, "") if File.basename(prefix + 'a') != 'a'
       prefix + relpath
diff --git a/version.h b/version.h
index ab05fa59aa..0f37481549 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.1"
-#define RUBY_RELEASE_DATE "2009-01-25"
+#define RUBY_RELEASE_DATE "2009-01-26"
 #define RUBY_PATCHLEVEL 5000
 #define RUBY_BRANCH_NAME "trunk"
 
@@ -8,7 +8,7 @@
 #define RUBY_VERSION_TEENY 1
 #define RUBY_RELEASE_YEAR 2009
 #define RUBY_RELEASE_MONTH 1
-#define RUBY_RELEASE_DAY 25
+#define RUBY_RELEASE_DAY 26
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];