diff --git a/src/main/java/com/ibm/watson/modelmesh/payload/RemotePayloadProcessor.java b/src/main/java/com/ibm/watson/modelmesh/payload/RemotePayloadProcessor.java
index 401fba2d..5c0e69d6 100644
--- a/src/main/java/com/ibm/watson/modelmesh/payload/RemotePayloadProcessor.java
+++ b/src/main/java/com/ibm/watson/modelmesh/payload/RemotePayloadProcessor.java
@@ -83,6 +83,7 @@ private static PayloadContent prepareContentBody(Payload payload) {
     }
 
     private static String encodeBinaryToString(ByteBuf byteBuf) {
+        byteBuf = byteBuf.readerIndex(0);
         ByteBuf encodedBinary = Base64.encode(byteBuf, byteBuf.readerIndex(), byteBuf.readableBytes(), false);
         //TODO custom jackson serialization for this field to avoid round-tripping to string
         return encodedBinary.toString(StandardCharsets.US_ASCII);