1 files changed, 3 insertions, 2 deletions
diff --git a/src/main/scala/firrtl/transforms/TopWiring.scala b/src/main/scala/firrtl/transforms/TopWiring.scala
index 2e123803..59c494c7 100644
--- a/src/main/scala/firrtl/transforms/TopWiring.scala
+++ b/src/main/scala/firrtl/transforms/TopWiring.scala
@@ -4,10 +4,11 @@ package TopWiring
 
 import firrtl._
 import firrtl.ir._
-import firrtl.passes.{InferTypes, ResolveKinds, ResolveFlows, ExpandConnects}
+import firrtl.passes.{InferTypes, LowerTypes, ResolveKinds, ResolveFlows, ExpandConnects}
 import firrtl.annotations._
 import firrtl.Mappers._
 import firrtl.stage.Forms
+import firrtl.options.Dependency
 
 import collection.mutable
 
@@ -33,7 +34,7 @@ class TopWiringTransform extends Transform with DependencyAPIMigration {
 
   override def prerequisites = Forms.MidForm
   override def optionalPrerequisites = Seq.empty
-  override def optionalPrerequisiteOf = Forms.MidEmitters
+  override def optionalPrerequisiteOf = Dependency(LowerTypes) +: Forms.MidEmitters
 
   override def invalidates(a: Transform): Boolean = a match {
     case InferTypes | ResolveKinds | ResolveFlows | ExpandConnects => true