diff --git a/src/add-ons/kernel/network/protocols/tcp/tcp.cpp b/src/add-ons/kernel/network/protocols/tcp/tcp.cpp
index e3df23489d..77877012c9 100644
--- a/src/add-ons/kernel/network/protocols/tcp/tcp.cpp
+++ b/src/add-ons/kernel/network/protocols/tcp/tcp.cpp
@@ -103,7 +103,7 @@ set_domain(net_interface *interface = NULL)
 static inline void
 bump_option(tcp_option *&option, size_t &length)
 {
-	length = option->length;
+	length += option->length;
 	option = (tcp_option *)((uint8 *)option + option->length);
 }