diff --git a/internal/backends/listenbrainz/listenbrainz_test.go b/internal/backends/listenbrainz/listenbrainz_test.go
index d6d577f..ddeac01 100644
--- a/internal/backends/listenbrainz/listenbrainz_test.go
+++ b/internal/backends/listenbrainz/listenbrainz_test.go
@@ -68,7 +68,7 @@ func TestListenBrainzListenAsListen(t *testing.T) {
 	assert.Equal(t, mbtypes.MBID("c0a1fc94-5f04-4a5f-bc09-e5de0c49cd12"), listen.RecordingMBID)
 	assert.Equal(t, mbtypes.MBID("d7f22677-9803-4d21-ba42-081b633a6f68"), listen.ReleaseMBID)
 	assert.Equal(t, mbtypes.MBID("80aca1ee-aa51-41be-9f75-024710d92ff4"), listen.ReleaseGroupMBID)
-	assert.Equal(t, "DES561620801", listen.ISRC)
+	assert.Equal(t, mbtypes.ISRC("DES561620801"), listen.ISRC)
 	assert.Equal(t, lbListen.TrackMetadata.AdditionalInfo["foo"], listen.AdditionalInfo["foo"])
 }
 
diff --git a/internal/backends/listenbrainz/models.go b/internal/backends/listenbrainz/models.go
index e86ce9d..833acd5 100644
--- a/internal/backends/listenbrainz/models.go
+++ b/internal/backends/listenbrainz/models.go
@@ -25,6 +25,7 @@ import (
 	"strconv"
 	"time"
 
+	"go.uploadedlobster.com/mbtypes"
 	"golang.org/x/exp/constraints"
 )
 
@@ -158,8 +159,8 @@ func (t Track) DiscNumber() int {
 	return 0
 }
 
-func (t Track) ISRC() string {
-	return tryGetValueOrEmpty[string](t.AdditionalInfo, "isrc")
+func (t Track) ISRC() mbtypes.ISRC {
+	return mbtypes.ISRC(tryGetValueOrEmpty[string](t.AdditionalInfo, "isrc"))
 }
 
 func (t Track) RecordingMBID() string {
diff --git a/internal/backends/listenbrainz/models_test.go b/internal/backends/listenbrainz/models_test.go
index 55e5267..f10f635 100644
--- a/internal/backends/listenbrainz/models_test.go
+++ b/internal/backends/listenbrainz/models_test.go
@@ -28,6 +28,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.uploadedlobster.com/mbtypes"
 	"go.uploadedlobster.com/scotty/internal/backends/listenbrainz"
 )
 
@@ -131,10 +132,10 @@ func TestTrackTrackNumberString(t *testing.T) {
 }
 
 func TestTrackIsrc(t *testing.T) {
-	expected := "TCAEJ1934417"
+	expected := mbtypes.ISRC("TCAEJ1934417")
 	track := listenbrainz.Track{
 		AdditionalInfo: map[string]any{
-			"isrc": expected,
+			"isrc": string(expected),
 		},
 	}
 	assert.Equal(t, expected, track.ISRC())
diff --git a/internal/backends/spotify/models.go b/internal/backends/spotify/models.go
index e80eccc..a22de21 100644
--- a/internal/backends/spotify/models.go
+++ b/internal/backends/spotify/models.go
@@ -22,6 +22,8 @@ THE SOFTWARE.
 
 package spotify
 
+import "go.uploadedlobster.com/mbtypes"
+
 type TracksResult struct {
 	Href     string       `json:"href"`
 	Limit    int          `json:"limit"`
@@ -98,9 +100,9 @@ type Artist struct {
 }
 
 type ExternalIds struct {
-	ISRC string `json:"isrc"`
-	EAN  string `json:"ean"`
-	UPC  string `json:"upc"`
+	ISRC mbtypes.ISRC `json:"isrc"`
+	EAN  string       `json:"ean"`
+	UPC  string       `json:"upc"`
 }
 
 type ExternalUrls struct {
diff --git a/internal/backends/spotify/spotify_test.go b/internal/backends/spotify/spotify_test.go
index bd7ff58..1aa7e87 100644
--- a/internal/backends/spotify/spotify_test.go
+++ b/internal/backends/spotify/spotify_test.go
@@ -26,6 +26,7 @@ import (
 	"github.com/spf13/viper"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.uploadedlobster.com/mbtypes"
 	"go.uploadedlobster.com/scotty/internal/backends/spotify"
 	"go.uploadedlobster.com/scotty/internal/config"
 )
@@ -59,7 +60,7 @@ func TestSpotifyListenAsListen(t *testing.T) {
 	assert.Equal(t, []string{"Dool"}, listen.ArtistNames)
 	assert.Equal(t, 5, listen.TrackNumber)
 	assert.Equal(t, 1, listen.DiscNumber)
-	assert.Equal(t, "DES561620801", listen.ISRC)
+	assert.Equal(t, mbtypes.ISRC("DES561620801"), listen.ISRC)
 	info := listen.AdditionalInfo
 	assert.Equal(t, "spotify.com", info["music_service"])
 	assert.Equal(t, "https://open.spotify.com/track/2JKUgGuXK3dEvyuIJ4Yj2V", info["origin_url"])
diff --git a/internal/models/models.go b/internal/models/models.go
index 39ae236..0d5abf2 100644
--- a/internal/models/models.go
+++ b/internal/models/models.go
@@ -44,7 +44,7 @@ type Track struct {
 	TrackNumber      int
 	DiscNumber       int
 	Duration         time.Duration
-	ISRC             string
+	ISRC             mbtypes.ISRC
 	RecordingMBID    mbtypes.MBID
 	ReleaseMBID      mbtypes.MBID
 	ReleaseGroupMBID mbtypes.MBID
diff --git a/internal/models/models_test.go b/internal/models/models_test.go
index 0deaefa..5395610 100644
--- a/internal/models/models_test.go
+++ b/internal/models/models_test.go
@@ -53,7 +53,7 @@ func TestTrackFillAdditionalInfo(t *testing.T) {
 		TrackNumber:      5,
 		DiscNumber:       1,
 		Duration:         time.Duration(413787 * time.Millisecond),
-		ISRC:             "DES561620801",
+		ISRC:             mbtypes.ISRC("DES561620801"),
 		Tags:             []string{"rock", "psychedelic rock"},
 	}
 	track.FillAdditionalInfo()