diff --git a/ChangeLog b/ChangeLog
index 8d3bef3df5..44670e5660 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Apr 17 22:07:50 2013  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/rubysocket.h (SOCKLEN_MAX): Expression simplified.
+
 Wed Apr 17 20:09:19 2013  Aman Gupta  <ruby@tmm1.net>
 
 	* compile.c (iseq_add_mark_object): Use new rb_iseq_add_mark_object().
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 1636a383cb..68f2734241 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -93,7 +93,7 @@ typedef int socklen_t;
 #endif
 
 #define SOCKLEN_MAX \
-  (0 < (((socklen_t)0)-1) ? \
+  (0 < (socklen_t)-1 ? \
    ~(socklen_t)0 : \
    (((((socklen_t)1) << (sizeof(socklen_t) * CHAR_BIT - 2)) - 1) * 2 + 1))