--- a/gfx/layers/ipc/LayersMessageUtils.h
+++ b/gfx/layers/ipc/LayersMessageUtils.h
@@ -435,24 +435,16 @@ struct ParamTraits<mozilla::layers::Focu
   static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
   {
     return ReadParam(aMsg, aIter, &aResult->mHorizontal) &&
            ReadParam(aMsg, aIter, &aResult->mVertical);
   }
 };
 
 template <>
-struct ParamTraits<mozilla::layers::FocusTarget::FocusTargetType>
-  : public ContiguousEnumSerializerInclusive<
-             mozilla::layers::FocusTarget::FocusTargetType,
-             mozilla::layers::FocusTarget::eNone,
-             mozilla::layers::FocusTarget::sHighestFocusTargetType>
-{};
-
-template <>
 struct ParamTraits<mozilla::layers::FocusTarget::NoFocusTarget>
   : public EmptyStructSerializer<mozilla::layers::FocusTarget::NoFocusTarget>
 {};
 
 template <>
 struct ParamTraits<mozilla::layers::FocusTarget>
 {
   typedef mozilla::layers::FocusTarget paramType;