diff --git a/include/net/tcp.h b/include/net/tcp.h
index 834089b..1ad82e3 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -67,6 +67,9 @@
 /* The least MTU to use for probing */
 #define TCP_BASE_MSS		1024
 
+/* Specify interval when tcp mtu probing will stop */
+#define TCP_PROBE_THRESHOLD	8
+
 /* After receiving this amount of duplicate ACKs fast retransmit starts. */
 #define TCP_FASTRETRANS_THRESH 3