diff --git a/ChangeLog b/ChangeLog
index 43cedd3f2a..0722f312aa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jul  1 04:21:10 2010  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/raddrinfo.c: don't use __P.
+
 Wed Jun 30 07:29:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/ruby/test_rubyoptions.rb (test_script_from_stdin): by using
diff --git a/ext/socket/raddrinfo.c b/ext/socket/raddrinfo.c
index 54b62aae37..a0a894ce47 100644
--- a/ext/socket/raddrinfo.c
+++ b/ext/socket/raddrinfo.c
@@ -97,7 +97,7 @@ ruby_getnameinfo__aix(const struct sockaddr *sa, size_t salen,
             ruby_getnameinfo__aix((sa), (salen), (host), (hostlen), (serv), (servlen), (flags))
 #endif
 
-static int str_isnumber __P((const char *));
+static int str_isnumber(const char *);
 
 #if defined(__APPLE__)
 /* fix [ruby-core:29427] */