diff --git a/src/main/scala/rocket/util.scala b/src/main/scala/rocket/util.scala
index 54eaf6e3..7f810d2a 100644
--- a/src/main/scala/rocket/util.scala
+++ b/src/main/scala/rocket/util.scala
@@ -30,7 +30,7 @@ object Util {
     def toInt: Int = if (x) 1 else 0
 
     // this one's snagged from scalaz
-    def option[T](z: T): Option[T] = if (x) Some(z) else None
+    def option[T](z: => T): Option[T] = if (x) Some(z) else None
   }
 }