diff --git a/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/join/NestedLoopJoin.java b/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/join/NestedLoopJoin.java
index 105a344..ba68caa 100644
--- a/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/join/NestedLoopJoin.java
+++ b/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/join/NestedLoopJoin.java
@@ -130,7 +130,8 @@
     }
 
     public void closeJoin(IFrameWriter writer) throws HyracksDataException {
-        for (ByteBuffer outBuffer : outBuffers) {
+        for (int i=0; i<currentMemSize; i++) {
+            ByteBuffer outBuffer = outBuffers.get(i);
             runFileReader = runFileWriter.createReader();
             runFileReader.open();
             while (runFileReader.nextFrame(innerBuffer)) {