diff --git a/include/netinet/tcp.h b/include/netinet/tcp.h
index b7828a502dafe96e309566f80110fe9547a2cd3c..b8c793499ffac8424c793af28b260a95086d8d5a 100644
--- a/include/netinet/tcp.h
+++ b/include/netinet/tcp.h
@@ -31,6 +31,39 @@
 #define SOL_TCP 6
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <endian.h>
+
+struct tcphdr
+{
+	u_int16_t source;
+	u_int16_t dest;
+	u_int32_t seq;
+	u_int32_t ack_seq;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	u_int16_t res1:4;
+	u_int16_t doff:4;
+	u_int16_t fin:1;
+	u_int16_t syn:1;
+	u_int16_t rst:1;
+	u_int16_t psh:1;
+	u_int16_t ack:1;
+	u_int16_t urg:1;
+	u_int16_t res2:2;
+#else
+	u_int16_t doff:4;
+	u_int16_t res1:4;
+	u_int16_t res2:2;
+	u_int16_t urg:1;
+	u_int16_t ack:1;
+	u_int16_t psh:1;
+	u_int16_t rst:1;
+	u_int16_t syn:1;
+	u_int16_t fin:1;
+#endif
+	u_int16_t window;
+	u_int16_t check;
+	u_int16_t urg_ptr;
+};
 #endif
 
 #endif