diff --git a/subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicApiGetMusicDirectoryTest.kt b/subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicApiGetMusicDirectoryTest.kt
index 09c7cbc0..8ec74983 100644
--- a/subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicApiGetMusicDirectoryTest.kt
+++ b/subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/SubsonicApiGetMusicDirectoryTest.kt
@@ -61,14 +61,14 @@ class SubsonicApiGetMusicDirectoryTest : SubsonicAPIClientTest() {
             childList.size `should be` 2
             childList[0] `should equal` MusicDirectoryChild(id = 4844L, parent = 4836L, isDir = false,
                     title = "Crash", album = "12 Stones", artist = "12 Stones", track = 1, year = 2002,
-                    genre = "Alternative Rock", coverArt = 4836L, size = 5348318L,
+                    genre = "Alternative Rock", coverArt = "4836", size = 5348318L,
                     contentType = "audio/mpeg", suffix = "mp3", duration = 222, bitRate = 192,
                     path = "12 Stones/12 Stones/01 Crash.mp3", isVideo = false, playCount = 0,
                     discNumber = 1, created = parseDate("2016-10-23T15:19:10.000Z"),
                     albumId = 454L, artistId = 288L, type = "music")
             childList[1] `should equal` MusicDirectoryChild(id = 4845L, parent = 4836L, isDir = false,
                     title = "Broken", album = "12 Stones", artist = "12 Stones", track = 2, year = 2002,
-                    genre = "Alternative Rock", coverArt = 4836L, size = 4309043L,
+                    genre = "Alternative Rock", coverArt = "4836", size = 4309043L,
                     contentType = "audio/mpeg", suffix = "mp3", duration = 179, bitRate = 192,
                     path = "12 Stones/12 Stones/02 Broken.mp3", isVideo = false, playCount = 0,
                     discNumber = 1, created = parseDate("2016-10-23T15:19:09.000Z"),
diff --git a/subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/models/MusicDirectoryChild.kt b/subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/models/MusicDirectoryChild.kt
index 4c2070f7..d1f01c3f 100644
--- a/subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/models/MusicDirectoryChild.kt
+++ b/subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/models/MusicDirectoryChild.kt
@@ -11,7 +11,7 @@ data class MusicDirectoryChild(val id: Long = -1L,
                                val track: Int = -1,
                                val year: Int? = null,
                                val genre: String = "",
-                               val coverArt: Long? = null,
+                               val coverArt: String = "",
                                val size: Long = -1,
                                val contentType: String = "",
                                val suffix: String = "",
diff --git a/ultrasonic/src/test/kotlin/org/moire/ultrasonic/data/APIConverterTest.kt b/ultrasonic/src/test/kotlin/org/moire/ultrasonic/data/APIConverterTest.kt
index 1a7f9465..b15e7456 100644
--- a/ultrasonic/src/test/kotlin/org/moire/ultrasonic/data/APIConverterTest.kt
+++ b/ultrasonic/src/test/kotlin/org/moire/ultrasonic/data/APIConverterTest.kt
@@ -101,7 +101,7 @@ class APIConverterTest {
     fun `Should convert MusicDirectoryChild entity`() {
         val entity = MusicDirectoryChild(id = 929L, parent = 11L, title = "some-title",
                 album = "some-album", albumId = 231L, artist = "some-artist", artistId = 1233L,
-                track = 12, year = 2002, genre = "some-genre", coverArt = 952L, size = 9418123L,
+                track = 12, year = 2002, genre = "some-genre", coverArt = "952", size = 9418123L,
                 contentType = "some-content-type", suffix = "some-suffix",
                 transcodedContentType = "some-transcoded-content-type",
                 transcodedSuffix = "some-transcoded-suffix", duration = 11, bitRate = 256,
@@ -126,7 +126,7 @@ class APIConverterTest {
             suffix `should equal to` entity.suffix
             transcodedContentType `should equal to` entity.transcodedContentType
             transcodedSuffix `should equal to` entity.transcodedSuffix
-            coverArt `should equal to` entity.coverArt.toString()
+            coverArt `should equal to` entity.coverArt
             size `should equal to` entity.size
             duration `should equal to` entity.duration
             bitRate `should equal to` entity.bitRate