diff --git a/src/header/netinet_tcp/mod.rs b/src/header/netinet_tcp/mod.rs
index f3694c629a..deaf15f95e 100644
--- a/src/header/netinet_tcp/mod.rs
+++ b/src/header/netinet_tcp/mod.rs
@@ -1,3 +1,7 @@
 use crate::platform::types::*;
 
 pub const TCP_NODELAY: c_int = 1;
+pub const TCP_MAXSEG: c_int = 2;
+pub const TCP_KEEPIDLE: c_int = 4;
+pub const TCP_KEEPINTVL: c_int = 5;
+pub const TCP_KEEPCNT: c_int = 6;