diff --git a/akka-slf4j/src/main/scala/akka/event/slf4j/Slf4jLogger.scala b/akka-slf4j/src/main/scala/akka/event/slf4j/Slf4jLogger.scala
index 3b20e68dfe..a36836efb0 100644
--- a/akka-slf4j/src/main/scala/akka/event/slf4j/Slf4jLogger.scala
+++ b/akka-slf4j/src/main/scala/akka/event/slf4j/Slf4jLogger.scala
@@ -73,7 +73,7 @@ class Slf4jLogger extends Actor with SLF4JLogging with RequiresMessageQueue[Logg
     case event @ Warning(logSource, logClass, message) ⇒
       withMdc(logSource, event) {
         event match {
-          case e: LogEventWithCause ⇒ Logger(logClass, logSource).warn(markerIfPresent(event), if (message != null) message.toString else null, e.cause)
+          case e: LogEventWithCause ⇒ Logger(logClass, logSource).warn(markerIfPresent(event), if (message != null) message.toString else e.cause.getLocalizedMessage, e.cause)
           case _                    ⇒ Logger(logClass, logSource).warn(markerIfPresent(event), if (message != null) message.toString else null)
         }
       }