diff --git a/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceRepository.kt b/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceRepository.kt
index 0bee66e448..ea1ee5fcdb 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceRepository.kt
+++ b/app/src/main/java/org/thoughtcrime/securesms/linkdevice/LinkDeviceRepository.kt
@@ -156,7 +156,8 @@ object LinkDeviceRepository {
       profileKey = ProfileKeyUtil.getSelfProfileKey(),
       masterKey = SignalStore.svr.masterKey,
       code = verificationCodeResult.verificationCode,
-      ephemeralMessageBackupKey = ephemeralMessageBackupKey
+      ephemeralMessageBackupKey = ephemeralMessageBackupKey,
+      mediaRootBackupKey = SignalStore.backup.mediaRootBackupKey
     )
 
     return when (deviceLinkResult) {
diff --git a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/link/LinkDeviceApi.kt b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/link/LinkDeviceApi.kt
index 7dfa25b218..2460c3b3d3 100644
--- a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/link/LinkDeviceApi.kt
+++ b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/link/LinkDeviceApi.kt
@@ -10,6 +10,7 @@ import org.signal.libsignal.protocol.IdentityKeyPair
 import org.signal.libsignal.protocol.ecc.ECPublicKey
 import org.signal.libsignal.zkgroup.profiles.ProfileKey
 import org.whispersystems.signalservice.api.NetworkResult
+import org.whispersystems.signalservice.api.backup.MediaRootBackupKey
 import org.whispersystems.signalservice.api.backup.MessageBackupKey
 import org.whispersystems.signalservice.api.kbs.MasterKey
 import org.whispersystems.signalservice.api.push.ServiceId.ACI
@@ -62,6 +63,7 @@ class LinkDeviceApi(private val pushServiceSocket: PushServiceSocket) {
     pniIdentityKeyPair: IdentityKeyPair,
     profileKey: ProfileKey,
     masterKey: MasterKey,
+    mediaRootBackupKey: MediaRootBackupKey,
     code: String,
     ephemeralMessageBackupKey: MessageBackupKey?
   ): NetworkResult<Unit> {
@@ -79,6 +81,7 @@ class LinkDeviceApi(private val pushServiceSocket: PushServiceSocket) {
         provisioningCode = code,
         provisioningVersion = ProvisioningVersion.CURRENT.value,
         masterKey = masterKey.serialize().toByteString(),
+        mediaRootBackupKey = mediaRootBackupKey.value.toByteString(),
         ephemeralBackupKey = ephemeralMessageBackupKey?.value?.toByteString()
       )
       val ciphertext = cipher.encrypt(message)