diff --git a/akka-remote/src/main/scala/akka/remote/Endpoint.scala b/akka-remote/src/main/scala/akka/remote/Endpoint.scala
index ac8783cf6e..23460b5c15 100644
--- a/akka-remote/src/main/scala/akka/remote/Endpoint.scala
+++ b/akka-remote/src/main/scala/akka/remote/Endpoint.scala
@@ -811,7 +811,7 @@ private[remote] class EndpointWriter(
     }
   } catch {
     case e: NotSerializableException ⇒
-      log.error(e, "Serializer not defined for message type []. Transient association error (association remains live)", s.message.getClass)
+      log.error(e, "Serializer not defined for message type [{}]. Transient association error (association remains live)", s.message.getClass)
       true
     case e: MessageSerializer.SerializationException ⇒
       log.error(e, "{} Transient association error (association remains live)", e.getMessage)