diff --git a/agent_test.go b/agent_test.go
index 6ea65bb..044987a 100644
--- a/agent_test.go
+++ b/agent_test.go
@@ -204,7 +204,7 @@ func BenchmarkAgent_Process(b *testing.B) {
 		}
 	}()
 	b.ReportAllocs()
-	m := MustBuild(TransactionID())
+	m := MustBuild(TransactionID)
 	for i := 0; i < b.N; i++ {
 		if err := a.Process(m); err != nil {
 			b.Fatal(err)
diff --git a/client_test.go b/client_test.go
index 2cf9941..ec2ca99 100644
--- a/client_test.go
+++ b/client_test.go
@@ -157,7 +157,7 @@ func TestClosedOrPanic(t *testing.T) {
 }
 
 func TestClient_Start(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	write := make(chan struct{}, 1)
 	read := make(chan struct{}, 1)
@@ -196,7 +196,7 @@ func TestClient_Start(t *testing.T) {
 		if err := c.Close(); err == nil {
 			t.Error("second close should fail")
 		}
-		if err := c.Do(MustBuild(TransactionID()), nil); err == nil {
+		if err := c.Do(MustBuild(TransactionID), nil); err == nil {
 			t.Error("Do after Close should fail")
 		}
 	}()
@@ -230,7 +230,7 @@ func TestClient_Start(t *testing.T) {
 }
 
 func TestClient_Do(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	conn := &testConnection{
 		b: response.Raw,
@@ -249,7 +249,7 @@ func TestClient_Do(t *testing.T) {
 		if err := c.Close(); err == nil {
 			t.Error("second close should fail")
 		}
-		if err := c.Do(MustBuild(TransactionID()), nil); err == nil {
+		if err := c.Do(MustBuild(TransactionID), nil); err == nil {
 			t.Error("Do after Close should fail")
 		}
 	}()
@@ -263,7 +263,7 @@ func TestClient_Do(t *testing.T) {
 	}); err != nil {
 		t.Error(err)
 	}
-	m = MustBuild(TransactionID())
+	m = MustBuild(TransactionID)
 	if err := c.Do(m, nil); err != nil {
 		t.Error(err)
 	}
@@ -335,7 +335,7 @@ func (a errorAgent) Stop([TransactionIDSize]byte) error {
 }
 
 func TestClientAgentError(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	conn := &testConnection{
 		b: response.Raw,
@@ -384,7 +384,7 @@ func TestClientConnErr(t *testing.T) {
 			t.Error(err)
 		}
 	}()
-	m := MustBuild(TransactionID())
+	m := MustBuild(TransactionID)
 	if err := c.Do(m, nil); err == nil {
 		t.Error("error expected")
 	}
@@ -412,7 +412,7 @@ func TestClientConnErrStopErr(t *testing.T) {
 			t.Error(err)
 		}
 	}()
-	m := MustBuild(TransactionID())
+	m := MustBuild(TransactionID)
 	if err := c.Do(m, NoopHandler()); err == nil {
 		t.Error("error expected")
 	}
@@ -470,7 +470,7 @@ func TestDialError(t *testing.T) {
 }
 
 func TestClientCloseErr(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	conn := &testConnection{
 		b: response.Raw,
@@ -494,7 +494,7 @@ func TestClientCloseErr(t *testing.T) {
 }
 
 func TestWithNoConnClose(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	closeErr := errClientCloseError
 	conn := &testConnection{
@@ -548,7 +548,7 @@ func (a *gcWaitAgent) Start(id [TransactionIDSize]byte, deadline time.Time) erro
 }
 
 func TestClientGC(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	conn := &testConnection{
 		b: response.Raw,
@@ -614,7 +614,7 @@ func TestClientFinalizer(t *testing.T) {
 	}
 	clientFinalizer(c)
 	clientFinalizer(c)
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	conn = &testConnection{
 		b: response.Raw,
@@ -738,7 +738,7 @@ func (n *manualAgent) Stop(id [TransactionIDSize]byte) error {
 }
 
 func TestClientRetransmission(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -801,7 +801,7 @@ func TestClientRetransmission(t *testing.T) {
 }
 
 func testClientDoConcurrent(t *testing.T, concurrency int) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -847,7 +847,7 @@ func testClientDoConcurrent(t *testing.T, concurrency int) {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			if doErr := c.Do(MustBuild(TransactionID(), BindingRequest), func(event Event) {
+			if doErr := c.Do(MustBuild(TransactionID, BindingRequest), func(event Event) {
 				if event.Error != nil {
 					t.Error("failed")
 				}
@@ -989,7 +989,7 @@ func TestClientClosedStart(t *testing.T) {
 }
 
 func TestWithNoRetransmit(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -1052,7 +1052,7 @@ func (c callbackClock) Now() time.Time {
 }
 
 func TestClientRTOStartErr(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -1164,7 +1164,7 @@ func TestClientRTOStartErr(t *testing.T) {
 }
 
 func TestClientRTOWriteErr(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -1285,7 +1285,7 @@ func TestClientRTOWriteErr(t *testing.T) {
 }
 
 func TestClientRTOAgentErr(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -1349,7 +1349,7 @@ func TestClientRTOAgentErr(t *testing.T) {
 }
 
 func TestClient_HandleProcessError(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	response.Encode()
 	connL, connR := net.Pipe()
 	defer connL.Close()
@@ -1391,7 +1391,7 @@ func TestClient_HandleProcessError(t *testing.T) {
 }
 
 func TestClientImmediateTimeout(t *testing.T) {
-	response := MustBuild(TransactionID(), BindingSuccess)
+	response := MustBuild(TransactionID, BindingSuccess)
 	connL, connR := net.Pipe()
 	defer connL.Close()
 	collector := new(manualCollector)
diff --git a/cmd/stun-client/stun_client.go b/cmd/stun-client/stun_client.go
index ad78566..5273276 100644
--- a/cmd/stun-client/stun_client.go
+++ b/cmd/stun-client/stun_client.go
@@ -23,7 +23,7 @@ func main() {
 	if err != nil {
 		log.Fatal("dial:", err)
 	}
-	if err = c.Do(stun.MustBuild(stun.TransactionID(), stun.BindingRequest), func(res stun.Event) {
+	if err = c.Do(stun.MustBuild(stun.TransactionID, stun.BindingRequest), func(res stun.Event) {
 		if res.Error != nil {
 			log.Fatalln(err)
 		}
diff --git a/cmd/stun-multiplex/main.go b/cmd/stun-multiplex/main.go
index 306e436..82a9405 100644
--- a/cmd/stun-multiplex/main.go
+++ b/cmd/stun-multiplex/main.go
@@ -25,7 +25,7 @@ func keepAlive(c *stun.Client) {
 	// Keep-alive for NAT binding.
 	t := time.NewTicker(time.Second * 5)
 	for range t.C {
-		if err := c.Do(stun.MustBuild(stun.TransactionID(), stun.BindingRequest), func(res stun.Event) {
+		if err := c.Do(stun.MustBuild(stun.TransactionID, stun.BindingRequest), func(res stun.Event) {
 			if res.Error != nil {
 				panic(res.Error)
 			}
@@ -119,7 +119,7 @@ func main() {
 	// This can fail if your NAT Server is strict and will use separate ports
 	// for application data and STUN
 	var gotAddr stun.XORMappedAddress
-	if err = c.Do(stun.MustBuild(stun.TransactionID(), stun.BindingRequest), func(res stun.Event) {
+	if err = c.Do(stun.MustBuild(stun.TransactionID, stun.BindingRequest), func(res stun.Event) {
 		if res.Error != nil {
 			panic(res.Error)
 		}
diff --git a/cmd/stun-nat-behaviour/main.go b/cmd/stun-nat-behaviour/main.go
index 1334ef3..448a09c 100644
--- a/cmd/stun-nat-behaviour/main.go
+++ b/cmd/stun-nat-behaviour/main.go
@@ -79,7 +79,7 @@ func MappingTests(addrStr string) error {
 
 	// Test I: Regular binding request
 	log.Info("Mapping Test I: Regular binding request")
-	request := stun.MustBuild(stun.TransactionID(), stun.BindingRequest)
+	request := stun.MustBuild(stun.TransactionID, stun.BindingRequest)
 
 	resp, err := mapTestConn.roundTrip(request, mapTestConn.RemoteAddr)
 	if err != nil {
@@ -153,7 +153,7 @@ func FilteringTests(addrStr string) error {
 
 	// Test I: Regular binding request
 	log.Info("Filtering Test I: Regular binding request")
-	request := stun.MustBuild(stun.TransactionID(), stun.BindingRequest)
+	request := stun.MustBuild(stun.TransactionID, stun.BindingRequest)
 
 	resp, err := mapTestConn.roundTrip(request, mapTestConn.RemoteAddr)
 	if err != nil || errors.Is(err, ErrTimedOut) {
diff --git a/cmd/stun-traversal/main.go b/cmd/stun-traversal/main.go
index a829fb2..dc6bf85 100644
--- a/cmd/stun-traversal/main.go
+++ b/cmd/stun-traversal/main.go
@@ -165,7 +165,7 @@ func listen(conn *net.UDPConn) <-chan []byte {
 }
 
 func sendBindingRequest(conn *net.UDPConn, addr *net.UDPAddr) error {
-	m := stun.MustBuild(stun.TransactionID(), stun.BindingRequest)
+	m := stun.MustBuild(stun.TransactionID, stun.BindingRequest)
 
 	err := send(m.Raw, conn, addr)
 	if err != nil {
diff --git a/e2e/main.go b/e2e/main.go
index a0f665a..bcfdfe7 100644
--- a/e2e/main.go
+++ b/e2e/main.go
@@ -36,7 +36,7 @@ func test(network string) {
 		log.Fatal(err) // nolint
 	}
 	// First request should error.
-	request, err := stun.Build(stun.BindingRequest, stun.TransactionID(), stun.Fingerprint)
+	request, err := stun.Build(stun.BindingRequest, stun.TransactionID, stun.Fingerprint)
 	if err != nil {
 		log.Fatalln("failed to build:", err) // nolint
 	}
@@ -64,7 +64,7 @@ func test(network string) {
 	}
 
 	// Authenticating and sending second request.
-	request, err = stun.Build(stun.TransactionID(), stun.BindingRequest,
+	request, err = stun.Build(stun.TransactionID, stun.BindingRequest,
 		stun.NewUsername(username), nonce, realm,
 		stun.NewLongTermIntegrity(username, realm.String(), password),
 		stun.Fingerprint,
diff --git a/helpers_test.go b/helpers_test.go
index edba4d8..e695f44 100644
--- a/helpers_test.go
+++ b/helpers_test.go
@@ -49,7 +49,7 @@ func TestMessage_Apply(t *testing.T) {
 		integrity = NewShortTermIntegrity("password")
 		decoded   = new(Message)
 	)
-	m, err := Build(BindingRequest, TransactionID(),
+	m, err := Build(BindingRequest, TransactionID,
 		NewUsername("username"),
 		NewNonce("nonce"),
 		NewRealm("example.org"),
diff --git a/message_test.go b/message_test.go
index 46d3b06..f8bf593 100644
--- a/message_test.go
+++ b/message_test.go
@@ -752,7 +752,7 @@ func TestAllocations(t *testing.T) {
 	// Not testing AttrMessageIntegrity because it allocates.
 	setters := []Setter{
 		BindingRequest,
-		TransactionID(),
+		TransactionID,
 		Fingerprint,
 		NewNonce("nonce"),
 		NewUsername("username"),
@@ -788,7 +788,7 @@ func TestAllocationsGetters(t *testing.T) {
 	// Not testing AttrMessageIntegrity because it allocates.
 	setters := []Setter{
 		BindingRequest,
-		TransactionID(),
+		TransactionID,
 		NewNonce("nonce"),
 		NewUsername("username"),
 		XORMappedAddress{
diff --git a/stun.go b/stun.go
index b14900b..52f0c47 100644
--- a/stun.go
+++ b/stun.go
@@ -48,6 +48,4 @@ func (transactionIDSetter) AddTo(m *Message) error {
 }
 
 // TransactionID is Setter for m.TransactionID.
-func TransactionID() Setter {
-	return transactionIDSetter{}
-}
+var TransactionID Setter = transactionIDSetter{} //nolint:gochecknoglobals