diff --git a/src/fmt/print.c b/src/fmt/print.c
index b9c050f..26b869b 100644
--- a/src/fmt/print.c
+++ b/src/fmt/print.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2010 Creytiv.com
  */
 #define _GNU_SOURCE 1
+#define __EXTENSIONS__ 1
 #include <string.h>
 #include <re_types.h>
 #include <re_sa.h>