1 files changed, 2 insertions, 0 deletions

diff --git a/testing/Messenger_test.c b/testing/Messenger_test.c
index 4fd81649..695c50ae 100644
--- a/testing/Messenger_test.c
+++ b/testing/Messenger_test.c
@@ -37,6 +37,8 @@
  *
  */
 
+#define _XOPEN_SOURCE 600
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif