diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/PrintRODsWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/PrintRODsWalker.java
index cbeb2e1dc..90de621d5 100755
--- a/java/src/org/broadinstitute/sting/playground/gatk/walkers/PrintRODsWalker.java
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/PrintRODsWalker.java
@@ -44,4 +44,6 @@ public class PrintRODsWalker extends RefWalker<Integer, Integer> {
     public Integer reduce(Integer value, Integer sum) {
         return sum + value;
     }
+
+    public void onTraversalDone(Integer result) {}    
 }
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