1 files changed, 3 insertions, 2 deletions
diff --git a/src/test/scala/firrtl/testutils/FirrtlSpec.scala b/src/test/scala/firrtl/testutils/FirrtlSpec.scala
index 09abf547..75739147 100644
--- a/src/test/scala/firrtl/testutils/FirrtlSpec.scala
+++ b/src/test/scala/firrtl/testutils/FirrtlSpec.scala
@@ -13,7 +13,7 @@ import org.scalatestplus.scalacheck._
 import firrtl._
 import firrtl.ir._
 import firrtl.Parser.UseInfo
-import firrtl.options.{Dependency, PreservesAll}
+import firrtl.options.Dependency
 import firrtl.stage.{FirrtlFileAnnotation, InfoModeAnnotation, RunFirrtlTransformAnnotation}
 import firrtl.analyses.{GetNamespace, ModuleNamespaceAnnotation}
 import firrtl.annotations._
@@ -33,9 +33,10 @@ class CheckLowForm extends SeqTransform {
 
 case class RenameTopAnnotation(newTopName: String) extends NoTargetAnnotation
 
-object RenameTop extends Transform with PreservesAll[Transform] {
+object RenameTop extends Transform {
   def inputForm = UnknownForm
   def outputForm = UnknownForm
+  override def invalidates(a: Transform) = false
 
   override val optionalPrerequisites = Seq(Dependency[RenameModules])