diff --git a/java/src/org/broadinstitute/sting/gatk/walkers/variantrecalibration/Tranche.java b/java/src/org/broadinstitute/sting/gatk/walkers/variantrecalibration/Tranche.java
index b4ffbfeff..1be2eb1d0 100755
--- a/java/src/org/broadinstitute/sting/gatk/walkers/variantrecalibration/Tranche.java
+++ b/java/src/org/broadinstitute/sting/gatk/walkers/variantrecalibration/Tranche.java
@@ -120,7 +120,7 @@ public class Tranche implements Comparable<Tranche> {
         if ( bindings.containsKey(key) )
             return Double.valueOf(bindings.get(key));
         else if ( required ) {
-            throw new UserException("Malformed tranches file.  Missing required key " + key);
+            throw new UserException.MalformedFile("Malformed tranches file.  Missing required key " + key);
         }
         else
             return -1;
@@ -130,7 +130,7 @@ public class Tranche implements Comparable<Tranche> {
         if ( bindings.containsKey(key) )
             return Integer.valueOf(bindings.get(key));
         else if ( required ) {
-            throw new UserException("Malformed tranches file.  Missing required key " + key);
+            throw new UserException.MalformedFile("Malformed tranches file.  Missing required key " + key);
         }
         else
             return -1;
@@ -177,4 +177,4 @@ public class Tranche implements Comparable<Tranche> {
             throw new UserException.CouldNotReadInputFile(f, e);
         }
     }
-}
\ No newline at end of file
+}