diff --git a/changelog/2558.added.md b/changelog/2558.added.md
new file mode 100644
index 0000000000..9940c30f8e
--- /dev/null
+++ b/changelog/2558.added.md
@@ -0,0 +1 @@
+Add the `TCP_FUNCTION_ALIAS` sockopt, on FreeBSD.
diff --git a/src/sys/socket/sockopt.rs b/src/sys/socket/sockopt.rs
index 9515541b57..c01259fb6a 100644
--- a/src/sys/socket/sockopt.rs
+++ b/src/sys/socket/sockopt.rs
@@ -330,6 +330,19 @@ sockopt_impl!(
     libc::TCP_FUNCTION_BLK,
     libc::tcp_function_set
 );
+#[cfg(target_os = "freebsd")]
+#[cfg(feature = "net")]
+sockopt_impl!(
+    #[cfg_attr(docsrs, doc(cfg(feature = "net")))]
+    /// Query the alias name of the set of function of the socket's TCP stack.
+    /// Uses the same field for the main name when getting from TCP_FUNCTION_BLK.
+    /// Empty if no alias.
+    TcpFunctionAlias,
+    GetOnly,
+    libc::IPPROTO_TCP,
+    libc::TCP_FUNCTION_ALIAS,
+    libc::tcp_function_set
+);
 sockopt_impl!(
     #[cfg_attr(docsrs, doc(cfg(feature = "net")))]
     /// Used to disable Nagle's algorithm.