diff --git a/bandb/bantool.c b/bandb/bantool.c
index 3b7f949a..81797449 100644
--- a/bandb/bantool.c
+++ b/bandb/bantool.c
@@ -38,7 +38,6 @@
  *
  */
 
-#define _XOPEN_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>