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-rw-r--r--src/extra/tcp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/extra/tcp.c b/src/extra/tcp.c
index bf161aa..d1cd79d 100644
--- a/src/extra/tcp.c
+++ b/src/extra/tcp.c
@@ -15,6 +15,7 @@
#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
+#define _GNU_SOURCE
#include <netinet/tcp.h>
#include <libnetfilter_queue/libnetfilter_queue.h>