diff --git a/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/Client.kt b/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/Client.kt
index 90023ee6b..1408615ba 100644
--- a/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/Client.kt
+++ b/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/Client.kt
@@ -113,7 +113,7 @@ object Client : RelayPool.Listener {
         checkNotInMainThread()
 
         subscribe(
-            object : Listener() {
+            object : Listener {
                 override fun onEvent(
                     event: Event,
                     subId: String,
@@ -152,7 +152,7 @@ object Client : RelayPool.Listener {
         Log.d("sendAndWaitForResponse", "Waiting for $size responses")
 
         val subscription =
-            object : Listener() {
+            object : Listener {
                 override fun onError(
                     error: Error,
                     subscriptionId: String,
@@ -363,7 +363,7 @@ object Client : RelayPool.Listener {
 
     fun getSubscriptionFilters(subId: String): List<TypedFilter> = subscriptions[subId] ?: emptyList()
 
-    abstract class Listener {
+    interface Listener {
         /** A new message was received */
         open fun onEvent(
             event: Event,
diff --git a/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/NostrDataSource.kt b/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/NostrDataSource.kt
index 82fa8ed8b..d49a53040 100644
--- a/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/NostrDataSource.kt
+++ b/ammolite/src/main/java/com/vitorpamplona/ammolite/relays/NostrDataSource.kt
@@ -67,7 +67,7 @@ abstract class NostrDataSource(
     ): Int = 31 * str1.hashCode() + str2.hashCode()
 
     private val clientListener =
-        object : Client.Listener() {
+        object : Client.Listener {
             override fun onEvent(
                 event: Event,
                 subscriptionId: String,