diff --git a/src/win/tcp.c b/src/win/tcp.c
index 1d18cdab..485d93da 100644
--- a/src/win/tcp.c
+++ b/src/win/tcp.c
@@ -71,7 +71,7 @@ static int uv__tcp_keepalive(uv_tcp_t* handle, SOCKET socket, int enable, unsign
 
   if (enable && setsockopt(socket,
                            IPPROTO_TCP,
-                           TCP_KEEPALIVE,
+                           SO_KEEPALIVE,
                            (const char*)&delay,
                            sizeof delay) == -1) {
     uv__set_sys_error(handle->loop, errno);
@@ -1068,4 +1068,4 @@ int uv_tcp_duplicate_socket(uv_tcp_t* handle, int pid,
   }
 
   return 0;
-}
\ No newline at end of file
+}