diff --git a/java/src/org/broadinstitute/sting/gatk/traversals/TraversalEngine.java b/java/src/org/broadinstitute/sting/gatk/traversals/TraversalEngine.java
index e164ed8da..1ab5510bf 100755
--- a/java/src/org/broadinstitute/sting/gatk/traversals/TraversalEngine.java
+++ b/java/src/org/broadinstitute/sting/gatk/traversals/TraversalEngine.java
@@ -507,7 +507,7 @@ public abstract class TraversalEngine {
 
     public <M, T> T traverse(Walker<M, T> walker) {
         T sum = null;
-        if ( hasLocations() && walker.ReduceByInterval() ) {
+        if ( hasLocations() && walker.isReduceByInterval() ) {
             logger.info("Doing reduce by interval processing");
             if ( ! hasLocations() )
                 Utils.scareUser("ReduceByInterval requested by no interval was provided");