diff --git a/src/main/java/de/rpr/ddnsclient/Updater.java b/src/main/java/de/rpr/ddnsclient/Updater.java
index 7ec107c..3967875 100644
--- a/src/main/java/de/rpr/ddnsclient/Updater.java
+++ b/src/main/java/de/rpr/ddnsclient/Updater.java
@@ -16,6 +16,7 @@ import java.time.Duration;
 import java.time.LocalDateTime;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 
 @ApplicationScoped
 public class Updater {
@@ -36,7 +37,7 @@ public class Updater {
                    PublicIpLookup publicIpLookup,
                    DnsResolver dnsResolver,
                    Config config,
-                   @ConfigProperty(name = "ddnsclient.backoff-duration:300s") Duration backoff) {
+                   @ConfigProperty(name = "ddnsclient.backoff-duration", defaultValue = "300s") Duration backoff) {
         this.dynDnsRouter = dynDnsRouter;
         this.publicIpLookup = publicIpLookup;
         this.dnsResolver = dnsResolver;
diff --git a/src/main/java/de/rpr/ddnsclient/lookup/DnsResolver.java b/src/main/java/de/rpr/ddnsclient/lookup/DnsResolver.java
index 29da784..9a54e77 100644
--- a/src/main/java/de/rpr/ddnsclient/lookup/DnsResolver.java
+++ b/src/main/java/de/rpr/ddnsclient/lookup/DnsResolver.java
@@ -27,7 +27,6 @@ public class DnsResolver {
 
         int resolveCounter = 0;
         try {
-
             Attributes result;
             do {
                 if (resolveCounter == MAX_RETRIES) {