diff --git a/lib/backend/memory/memory.go b/lib/backend/memory/memory.go
index 58a384f96a498..1b78e9e2dfc94 100644
--- a/lib/backend/memory/memory.go
+++ b/lib/backend/memory/memory.go
@@ -113,6 +113,10 @@ func New(cfg Config) (*Memory, error) {
 
 // Memory is a memory B-Tree based backend
 type Memory struct {
+	// nextID is a next record ID
+	// intentionally placed first to ensure 64-bit alignment
+	nextID int64
+
 	*sync.Mutex
 	*log.Entry
 	Config
@@ -126,8 +130,6 @@ type Memory struct {
 	// ctx is a context signalling close
 	ctx context.Context
 	buf *backend.CircularBuffer
-	//  nextID is a next record ID
-	nextID int64
 }
 
 // Close closes memory backend
diff --git a/lib/reversetunnel/conn.go b/lib/reversetunnel/conn.go
index 557b585f2b8fa..a0d4915217014 100644
--- a/lib/reversetunnel/conn.go
+++ b/lib/reversetunnel/conn.go
@@ -45,6 +45,10 @@ type connKey struct {
 
 // remoteConn holds a connection to a remote host, either node or proxy.
 type remoteConn struct {
+	// lastHeartbeat is the last time a heartbeat was received.
+	// intentionally placed first to ensure 64-bit alignment
+	lastHeartbeat int64
+
 	*connConfig
 	mu  sync.Mutex
 	log *logrus.Entry
@@ -68,9 +72,6 @@ type remoteConn struct {
 
 	// clock is used to control time in tests.
 	clock clockwork.Clock
-
-	// lastHeartbeat is the last time a heartbeat was received.
-	lastHeartbeat int64
 }
 
 // connConfig is the configuration for the remoteConn.
diff --git a/lib/srv/keepalive_test.go b/lib/srv/keepalive_test.go
index 068bec7d36a61..cf712fa39b224 100644
--- a/lib/srv/keepalive_test.go
+++ b/lib/srv/keepalive_test.go
@@ -123,8 +123,8 @@ func waitForRequests(requestSender *testRequestSender, count int) error {
 }
 
 type testRequestSender struct {
+	count int64 // intentionally placed first to ensure 64-bit alignment
 	reply bool
-	count int64
 }
 
 func (n *testRequestSender) SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error) {
diff --git a/lib/utils/conn.go b/lib/utils/conn.go
index c43aac61d44c4..a8653d63ba273 100644
--- a/lib/utils/conn.go
+++ b/lib/utils/conn.go
@@ -175,8 +175,8 @@ func (r *TrackingReader) Read(b []byte) (int, error) {
 // written.
 // It's thread-safe if the underlying io.Writer is thread-safe.
 type TrackingWriter struct {
+	count uint64 // intentionally placed first to ensure 64-bit alignment
 	w     io.Writer
-	count uint64
 }
 
 // NewTrackingWriter creates a TrackingWriter around w.