diff --git a/datatrack/datatracktest/testutils.go b/datatrack/datatracktest/testutils.go
index 86a59838a..ea29b5fa5 100644
--- a/datatrack/datatracktest/testutils.go
+++ b/datatrack/datatracktest/testutils.go
@@ -20,7 +20,6 @@ import (
 	"time"
 
 	"github.com/livekit/protocol/datatrack"
-	"github.com/livekit/protocol/livekit"
 )
 
 func GenerateRawDataPackets(handle uint16, seqNum uint16, frameNum uint16, numFrames int, frameSize int, frameDuration time.Duration) [][]byte {
@@ -59,7 +58,7 @@ func GenerateRawDataPackets(handle uint16, seqNum uint16, frameNum uint16, numFr
 				Payload: payload,
 			}
 			if extParticipantSid, err := datatrack.NewExtensionParticipantSid("test_participant"); err == nil {
-				if ext, err := extParticipantSid.Marshal(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID); err == nil {
+				if ext, err := extParticipantSid.Marshal(); err == nil {
 					packet.AddExtension(ext)
 				}
 			}
diff --git a/datatrack/extension_participant_sid.go b/datatrack/extension_participant_sid.go
index 074055222..acac8384e 100644
--- a/datatrack/extension_participant_sid.go
+++ b/datatrack/extension_participant_sid.go
@@ -36,11 +36,11 @@ func (e *ExtensionParticipantSid) ParticipantID() livekit.ParticipantID {
 	return e.participantID
 }
 
-func (e *ExtensionParticipantSid) Marshal(extID livekit.DataTrackExtensionID) (Extension, error) {
+func (e *ExtensionParticipantSid) Marshal() (Extension, error) {
 	data := make([]byte, len(e.participantID))
 	copy(data, e.participantID)
 	return Extension{
-		id:   uint8(extID),
+		id:   uint8(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID),
 		data: data,
 	}, nil
 }
diff --git a/datatrack/extension_participant_sid_test.go b/datatrack/extension_participant_sid_test.go
index 5fe168dcc..b2a58d04c 100644
--- a/datatrack/extension_participant_sid_test.go
+++ b/datatrack/extension_participant_sid_test.go
@@ -35,7 +35,7 @@ func TestExtensionParticipantSid(t *testing.T) {
 		id:   uint8(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID),
 		data: []byte{'t', 'e', 's', 't'},
 	}
-	ext, err := extParticipantSid.Marshal(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID)
+	ext, err := extParticipantSid.Marshal()
 	require.NoError(t, err)
 	require.Equal(t, expectedExt, ext)
 
diff --git a/datatrack/packet_test.go b/datatrack/packet_test.go
index a0f1efd3a..2f6faded0 100644
--- a/datatrack/packet_test.go
+++ b/datatrack/packet_test.go
@@ -73,7 +73,7 @@ func TestPacket(t *testing.T) {
 			Payload: payload,
 		}
 		if extParticipantSid, err := NewExtensionParticipantSid("test_participant"); err == nil {
-			if ext, err := extParticipantSid.Marshal(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID); err == nil {
+			if ext, err := extParticipantSid.Marshal(); err == nil {
 				packet.AddExtension(ext)
 			}
 		}
@@ -120,7 +120,7 @@ func TestPacket(t *testing.T) {
 			Payload: payload,
 		}
 		if extParticipantSid, err := NewExtensionParticipantSid("participant"); err == nil {
-			if ext, err := extParticipantSid.Marshal(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID); err == nil {
+			if ext, err := extParticipantSid.Marshal(); err == nil {
 				packet.AddExtension(ext)
 			}
 		}
@@ -166,7 +166,7 @@ func TestPacket(t *testing.T) {
 			Payload: payload,
 		}
 		if extParticipantSid, err := NewExtensionParticipantSid("participant"); err == nil {
-			if ext, err := extParticipantSid.Marshal(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID); err == nil {
+			if ext, err := extParticipantSid.Marshal(); err == nil {
 				packet.AddExtension(ext)
 			}
 		}
@@ -183,7 +183,7 @@ func TestPacket(t *testing.T) {
 
 		// replace existing extension ID and ensure that marshalled packet is updated
 		if extParticipantSid, err := NewExtensionParticipantSid("test_participant"); err == nil {
-			if ext, err := extParticipantSid.Marshal(livekit.DataTrackExtensionID_DTEI_PARTICIPANT_SID); err == nil {
+			if ext, err := extParticipantSid.Marshal(); err == nil {
 				packet.AddExtension(ext)
 			}
 		}