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-rw-r--r--extensions/libxt_string.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/extensions/libxt_string.c b/extensions/libxt_string.c
index eef0b081..8cee3359 100644
--- a/extensions/libxt_string.c
+++ b/extensions/libxt_string.c
@@ -20,6 +20,7 @@
* updated to work with slightly modified
* ipt_string_info.
*/
+#define _GNU_SOURCE 1 /* strnlen for older glibcs */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>