diff --git a/ChangeLog b/ChangeLog
index d71ab4e8c8..e441b82286 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Jul 13 00:07:07 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/ipaddr.rb (IPAddr#initialize): get rid of ArgumentError in
+	  IPAddr#to_range.  a patch from okkez <okkez000 AT gmail.com> in
+	  [ruby-dev:35091].
+
 Sun Jul 13 00:02:26 2008  Tanaka Akira  <akr@fsij.org>
 
 	* configure.in (erfc): erfc of glibc comes with Debian GNU/Linux Etch
diff --git a/lib/ipaddr.rb b/lib/ipaddr.rb
index 17e47f016f..1801d9d86f 100644
--- a/lib/ipaddr.rb
+++ b/lib/ipaddr.rb
@@ -438,7 +438,7 @@ class IPAddr
     if prefixlen
       mask!(prefixlen)
     else
-      @mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
+      @mask_addr = (@family == Socket::AF_INET) ? IN4MASK : IN6MASK
     end
   end
 
diff --git a/version.h b/version.h
index 99b141df7d..8261730f64 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2008-07-13"
 #define RUBY_VERSION_CODE 186
 #define RUBY_RELEASE_CODE 20080713
-#define RUBY_PATCHLEVEL 274
+#define RUBY_PATCHLEVEL 275
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8