diff --git a/scala/src/org/broadinstitute/sting/queue/function/DispatchFunction.scala b/scala/src/org/broadinstitute/sting/queue/function/DispatchFunction.scala
index 8d441ab10..0a685d545 100644
--- a/scala/src/org/broadinstitute/sting/queue/function/DispatchFunction.scala
+++ b/scala/src/org/broadinstitute/sting/queue/function/DispatchFunction.scala
@@ -10,6 +10,7 @@ trait DispatchFunction extends InputOutputFunction {
 
   @Input
   @Optional
+  @ClassType(classOf[Int])
   var memoryLimit: Option[Int] = None
 
   /**