diff --git a/src/lsd.cpp b/src/lsd.cpp
index 312c90af7..b1aaf3c52 100644
--- a/src/lsd.cpp
+++ b/src/lsd.cpp
@@ -87,7 +87,7 @@ lsd::lsd(io_service& ios, peer_callback_t const& cb
 	, m_log_cb(log)
 #endif
 	, m_broadcast_timer(ios)
-	, m_cookie(random())
+	, m_cookie(random() & 0x7fffffff)
 	, m_disabled(false)
 #if TORRENT_USE_IPV6
 	, m_disabled6(false)