diff --git a/src/ops.c b/src/ops.c
index 1809424..6e929e1 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -1,3 +1,5 @@
+#define _XOPEN_SOURCE 700
+#include <stdio.h>
 /*   (C) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 Stijn van Dongen
  *
  * This file is part of Zoem. You can redistribute and/or modify Zoem under the
diff --git a/src/read.c b/src/read.c
index 5763592..a4b40d6 100644
--- a/src/read.c
+++ b/src/read.c
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE 700
 /*   (C) Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 Stijn van Dongen
  *
  * This file is part of Zoem. You can redistribute and/or modify Zoem under the