diff --git a/ChangeLog b/ChangeLog
index 2ade3a2ca5..77d9a74d4a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Jul 12 23:24:21 2008  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/socket.c: use PRIuSIZE.
+
 Sat Jul 12 22:41:39 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (PRI_PTRDIFF_PREFIX, PRI_SIZE_PREFIX): fixed typo.
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index c32c6133b5..f4cfb3bd84 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -883,8 +883,8 @@ host_str(VALUE host, char *hbuf, size_t len)
 	    make_inetaddr(INADDR_BROADCAST, hbuf, len);
 	}
 	else if (strlen(name) >= len) {
-	    rb_raise(rb_eArgError, "hostname too long (%"PRIuVALUE")",
-                (VALUE)strlen(name));
+	    rb_raise(rb_eArgError, "hostname too long (%"PRIuSIZE")",
+                strlen(name));
 	}
 	else {
 	    strcpy(hbuf, name);
@@ -909,8 +909,8 @@ port_str(VALUE port, char *pbuf, size_t len)
 	SafeStringValue(port);
 	serv = RSTRING_PTR(port);
 	if (strlen(serv) >= len) {
-	    rb_raise(rb_eArgError, "service name too long (%"PRIuVALUE")",
-                (VALUE)strlen(serv));
+	    rb_raise(rb_eArgError, "service name too long (%"PRIuSIZE")",
+                strlen(serv));
 	}
 	strcpy(pbuf, serv);
 	return pbuf;