diff --git a/etcdserver/raft.go b/etcdserver/raft.go
index f6d2da30d..4f11a23ee 100644
--- a/etcdserver/raft.go
+++ b/etcdserver/raft.go
@@ -79,6 +79,13 @@ type apply struct {
 }
 
 type raftNode struct {
+	// Cache of the latest raft index and raft term the server has seen.
+	// These three unit64 fields must be the first elements to keep 64-bit
+	// alignment for atomic access to the fields.
+	index uint64
+	term  uint64
+	lead  uint64
+
 	raft.Node
 
 	// a chan to send out apply
@@ -99,11 +106,6 @@ type raftNode struct {
 	// If transport is nil, server will panic.
 	transport rafthttp.Transporter
 
-	// Cache of the latest raft index and raft term the server has seen
-	index uint64
-	term  uint64
-	lead  uint64
-
 	stopped chan struct{}
 	done    chan struct{}
 }
diff --git a/etcdserver/server.go b/etcdserver/server.go
index 149f65724..c8ad680da 100644
--- a/etcdserver/server.go
+++ b/etcdserver/server.go
@@ -141,11 +141,13 @@ type Server interface {
 
 // EtcdServer is the production implementation of the Server interface
 type EtcdServer struct {
+	// r must be the first element to keep 64-bit alignment for atomic
+	// access to fields
+	r raftNode
+
 	cfg       *ServerConfig
 	snapCount uint64
 
-	r raftNode
-
 	w          wait.Wait
 	stop       chan struct{}
 	done       chan struct{}
diff --git a/store/watcher_hub.go b/store/watcher_hub.go
index d27ace06b..d573eb331 100644
--- a/store/watcher_hub.go
+++ b/store/watcher_hub.go
@@ -31,9 +31,13 @@ import (
 // event happens between the end of the first watch command and the start
 // of the second command.
 type watcherHub struct {
+	// count must be the first element to keep 64-bit alignment for atomic
+	// access
+
+	count int64 // current number of watchers.
+
 	mutex        sync.Mutex
 	watchers     map[string]*list.List
-	count        int64 // current number of watchers.
 	EventHistory *EventHistory
 }