diff --git a/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/PipelinedSorter.java b/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/PipelinedSorter.java
index d0eeadca06..937f898ad4 100644
--- a/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/PipelinedSorter.java
+++ b/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/sort/impl/PipelinedSorter.java
@@ -945,8 +945,7 @@ public SortSpan(ByteBuffer source, int maxItems, int perItem, RawComparator comp
         // try to allocate less meta space, because we have sample data
         metasize = METASIZE*(capacity/(perItem+METASIZE));
       }
-      ByteBuffer reserved = source.duplicate();
-      reserved.mark();
+      ByteBuffer reserved = (ByteBuffer) source.duplicate().mark();
       LOG.info(outputContext.getInputOutputVertexNames() + ": " + "reserved.remaining()=" +
           reserved.remaining() + ", reserved.metasize=" + metasize);
       reserved.position(metasize);