diff -up php-5.3.9/ext/mysqlnd/config9.m4.mysqlnd php-5.3.9/ext/mysqlnd/config9.m4
diff -up php-5.3.9/ext/mysqlnd/mysqlnd.c.mysqlnd php-5.3.9/ext/mysqlnd/mysqlnd.c
--- php-5.3.9/ext/mysqlnd/mysqlnd.c.mysqlnd	2012-01-01 14:15:04.000000000 +0100
+++ php-5.3.9/ext/mysqlnd/mysqlnd.c	2012-01-10 19:12:06.813933986 +0100
@@ -620,7 +620,7 @@ MYSQLND_METHOD(mysqlnd_conn, connect)(MY
 		if (host_len == sizeof("localhost") - 1 && !strncasecmp(host, "localhost", host_len)) {
 			DBG_INF_FMT("socket=%s", socket_or_pipe? socket_or_pipe:"n/a");
 			if (!socket_or_pipe) {
-				socket_or_pipe = "/tmp/mysql.sock";
+				socket_or_pipe = "/var/lib/mysql/mysql.sock";
 			}
 			transport_len = spprintf(&transport, 0, "unix://%s", socket_or_pipe);
 			unix_socket = TRUE;
diff -up php-5.3.9/ext/pdo_mysql/pdo_mysql.c.mysqlnd php-5.3.9/ext/pdo_mysql/pdo_mysql.c
--- php-5.3.9/ext/pdo_mysql/pdo_mysql.c.mysqlnd	2012-01-01 14:15:04.000000000 +0100
+++ php-5.3.9/ext/pdo_mysql/pdo_mysql.c	2012-01-10 19:17:51.608942238 +0100
@@ -50,7 +50,7 @@ ZEND_DECLARE_MODULE_GLOBALS(pdo_mysql);
 #  define PDO_MYSQL_UNIX_ADDR PHP_MYSQL_UNIX_SOCK_ADDR
 # else
 #  if !PHP_WIN32
-#   define PDO_MYSQL_UNIX_ADDR "/tmp/mysql.sock"
+#   define PDO_MYSQL_UNIX_ADDR "/var/lib/mysql/mysql.sock"
 #  else
 #   define PDO_MYSQL_UNIX_ADDR NULL
 #  endif