diff --git a/build.gradle b/build.gradle
index 44e352367..ba81efdad 100644
--- a/build.gradle
+++ b/build.gradle
@@ -67,6 +67,7 @@ dependencies {
     implementation 'com.github.natario1:Egloo:v0.4.0'
 
     implementation 'org.jxmpp:jxmpp-jid:1.0.3'
+    implementation 'org.jxmpp:jxmpp-stringprep-libidn:1.0.3'
     implementation 'org.osmdroid:osmdroid-android:6.1.11'
     implementation 'org.hsluv:hsluv:0.2'
     implementation 'org.conscrypt:conscrypt-android:2.5.2'
diff --git a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
index dcb613399..d24b22edc 100644
--- a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
+++ b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
@@ -33,7 +33,6 @@ import android.os.Bundle;
 import android.os.Environment;
 import android.os.IBinder;
 import android.os.Messenger;
-import android.os.Parcelable;
 import android.os.PowerManager;
 import android.os.PowerManager.WakeLock;
 import android.os.SystemClock;
@@ -60,6 +59,7 @@ import com.google.common.base.Optional;
 import com.google.common.base.Strings;
 
 import org.conscrypt.Conscrypt;
+import org.jxmpp.stringprep.libidn.LibIdnXmppStringprep;
 import org.openintents.openpgp.IOpenPgpService2;
 import org.openintents.openpgp.util.OpenPgpApi;
 import org.openintents.openpgp.util.OpenPgpServiceConnection;
@@ -68,7 +68,6 @@ import java.io.File;
 import java.security.Security;
 import java.security.cert.CertificateException;
 import java.security.cert.X509Certificate;
-import java.text.ParseException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -81,7 +80,6 @@ import java.util.ListIterator;
 import java.util.Map;
 import java.util.Set;
 import java.util.WeakHashMap;
-import java.util.concurrent.Callable;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
@@ -131,7 +129,6 @@ import eu.siacs.conversations.ui.UiCallback;
 import eu.siacs.conversations.ui.interfaces.OnAvatarPublication;
 import eu.siacs.conversations.ui.interfaces.OnMediaLoaded;
 import eu.siacs.conversations.ui.interfaces.OnSearchResultsAvailable;
-import eu.siacs.conversations.utils.AccountUtils;
 import eu.siacs.conversations.utils.Compatibility;
 import eu.siacs.conversations.utils.ConversationsFileObserver;
 import eu.siacs.conversations.utils.CryptoHelper;
@@ -1157,6 +1154,7 @@ public class XmppConnectionService extends Service {
     @SuppressLint("TrulyRandom")
     @Override
     public void onCreate() {
+        LibIdnXmppStringprep.setup();
         if (Compatibility.runsTwentySix()) {
             mNotificationService.initializeChannels();
         }