diff --git a/akka-http-marshallers-scala/akka-http-spray-json/src/main/scala/akka/http/scaladsl/marshallers/sprayjson/SprayJsonSupport.scala b/akka-http-marshallers-scala/akka-http-spray-json/src/main/scala/akka/http/scaladsl/marshallers/sprayjson/SprayJsonSupport.scala
index 6d10f5f8ab..57ac42d3e8 100644
--- a/akka-http-marshallers-scala/akka-http-spray-json/src/main/scala/akka/http/scaladsl/marshallers/sprayjson/SprayJsonSupport.scala
+++ b/akka-http-marshallers-scala/akka-http-spray-json/src/main/scala/akka/http/scaladsl/marshallers/sprayjson/SprayJsonSupport.scala
@@ -23,7 +23,7 @@ trait SprayJsonSupport {
   implicit def sprayJsValueUnmarshaller: FromEntityUnmarshaller[JsValue] =
     Unmarshaller.byteStringUnmarshaller.forContentTypes(`application/json`).mapWithCharset { (data, charset) ⇒
       val input =
-        if (charset == HttpCharsets.`UTF-8`) ParserInput(data.utf8String)
+        if (charset == HttpCharsets.`UTF-8`) ParserInput(data.toArray)
         else ParserInput(data.decodeString(charset.nioCharset.name)) // FIXME: identify charset by instance, not by name!
       JsonParser(input)
     }