diff --git a/proto.go b/proto.go
index 3e9debd..45f12ab 100644
--- a/proto.go
+++ b/proto.go
@@ -99,9 +99,11 @@ var (
 
 // Message represents an arpc Message.
 type Message struct {
+	// 64-aligned on 32-bit
+	ref int32
+
 	Buffer []byte
 
-	ref     int32
 	handler Handler
 	values  map[interface{}]interface{}
 }
diff --git a/server.go b/server.go
index 12311de..6caa3e8 100644
--- a/server.go
+++ b/server.go
@@ -22,6 +22,9 @@ type Server struct {
 	CurrLoad int64
 	MaxLoad  int64
 
+	// 64-aligned on 32-bit
+	seq uint64
+
 	Codec   codec.Codec
 	Handler Handler
 
@@ -29,7 +32,6 @@ type Server struct {
 
 	mux sync.Mutex
 
-	seq     uint64
 	running bool
 	chStop  chan error
 	clients map[*Client]util.Empty