tracker/udp-server_test.go   | 2 +-
 tracker/udp/protocol.go      | 2 +-
 tracker/udp/server/server.go | 2 +-

diff --git a/tracker/udp-server_test.go b/tracker/udp-server_test.go
index b32fe853b8259bd725a538f653c5a6e3cd6eec0c..7308ed0d8ef322514cfff25b1331976ffc564fa1 100644
--- a/tracker/udp-server_test.go
+++ b/tracker/udp-server_test.go
@@ -47,7 +47,7 @@ 	return
 }
 
 func (s *server) newConn() (ret udp.ConnectionId) {
-	ret = rand.Int63()
+	ret = rand.Uint64()
 	if s.conns == nil {
 		s.conns = make(map[udp.ConnectionId]struct{})
 	}
diff --git a/tracker/udp/protocol.go b/tracker/udp/protocol.go
index f6beb4c6d55c3e495730fcac1caebfc23c717d4e..653d013efcd5367888ea6bde3af13d7d6ae7d749 100644
--- a/tracker/udp/protocol.go
+++ b/tracker/udp/protocol.go
@@ -26,7 +26,7 @@ )
 
 type TransactionId = int32
 
-type ConnectionId = int64
+type ConnectionId = uint64
 
 type ConnectionRequest struct {
 	ConnectionId  ConnectionId
diff --git a/tracker/udp/server/server.go b/tracker/udp/server/server.go
index dfcc6500a0e12776c865b49a0eb1c195c7cb8001..20e827b9737bbecb614622edfb22eaeb2a09f21e 100644
--- a/tracker/udp/server/server.go
+++ b/tracker/udp/server/server.go
@@ -181,7 +181,7 @@ 	_, err := rand.Read(b[:])
 	if err != nil {
 		panic(err)
 	}
-	return int64(binary.BigEndian.Uint64(b[:]))
+	return binary.BigEndian.Uint64(b[:])
 }
 
 func RunSimple(ctx context.Context, s *Server, pc net.PacketConn, family udp.AddrFamily) error {