diff --git a/src/netutils.h b/src/netutils.h
index 2f1be483..92fb0c17 100644
--- a/src/netutils.h
+++ b/src/netutils.h
@@ -26,6 +26,8 @@
 // only enable TCP_FASTOPEN on linux
 #if defined(__linux__)
 
+#include <linux/tcp.h>
+
 /*  conditional define for TCP_FASTOPEN */
 #ifndef TCP_FASTOPEN
 #define TCP_FASTOPEN   23
@@ -44,10 +46,9 @@
 
 #endif
 
-
 /* Define the flag MPTCP_ENABLED if not defined*/
 #ifndef MPTCP_ENABLED
-#define MPTCP_ENABLED 26
+#define MPTCP_ENABLED 42
 #endif
 
 /** byte size of ip4 address */