diff --git a/rocket/src/main/scala/fpu.scala b/rocket/src/main/scala/fpu.scala
index 0b8190c1..b7c72945 100644
--- a/rocket/src/main/scala/fpu.scala
+++ b/rocket/src/main/scala/fpu.scala
@@ -9,8 +9,8 @@ import FPConstants._
 import uncore.constants.MemoryOpConstants._
 import cde.{Parameters, Field}
 
-case object SFMALatency
-case object DFMALatency
+case object SFMALatency extends Field[Int]
+case object DFMALatency extends Field[Int]
 
 object FPConstants
 {