diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/indels/PairHMMIndelErrorModel.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/indels/PairHMMIndelErrorModel.java
index ef1c14576..319f41d53 100755
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/indels/PairHMMIndelErrorModel.java
+++ b/public/java/src/org/broadinstitute/sting/gatk/walkers/indels/PairHMMIndelErrorModel.java
@@ -622,7 +622,7 @@ public class PairHMMIndelErrorModel {
             if ( b1[i]!= b2[i])
                 return i;
         }
-        return 0; // sanity check
+        return b1.length;
     }
 
     private int computeFirstDifferingPosition(double[] b1, double[] b2) {
@@ -633,7 +633,7 @@ public class PairHMMIndelErrorModel {
             if ( b1[i]!= b2[i])
                 return i;
         }
-        return 0; // sanity check
+        return b1.length;
     }
 
     private final static double[] getHaplotypeLikelihoods(final int numHaplotypes, final int readCounts[], final double readLikelihoods[][]) {