diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/validation/GenotypeAndValidate.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/validation/GenotypeAndValidate.java
index 832c0ede3..79b6e17f6 100755
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/validation/GenotypeAndValidate.java
+++ b/public/java/src/org/broadinstitute/sting/gatk/walkers/validation/GenotypeAndValidate.java
@@ -333,8 +333,9 @@ public class GenotypeAndValidate extends RodWalker<GenotypeAndValidate.CountedDa
         snpEngine = new UnifiedGenotyperEngine(getToolkit(), uac);
 
         // Adding the INDEL calling arguments for UG
-        uac.GLmodel = GenotypeLikelihoodsCalculationModel.Model.INDEL;
-        indelEngine = new UnifiedGenotyperEngine(getToolkit(), uac);
+        UnifiedArgumentCollection uac_indel = new UnifiedArgumentCollection(uac);
+        uac_indel.GLmodel = GenotypeLikelihoodsCalculationModel.Model.INDEL;
+        indelEngine = new UnifiedGenotyperEngine(getToolkit(), uac_indel);
 
         // make sure we have callConf set to the threshold set by the UAC so we can use it later.
         callConf = uac.STANDARD_CONFIDENCE_FOR_CALLING;