diff --git a/core/src/main/scala/chisel3/experimental/hierarchy/core/Instance.scala b/core/src/main/scala/chisel3/experimental/hierarchy/core/Instance.scala
index 6e4b5c496ed..967791ef269 100644
--- a/core/src/main/scala/chisel3/experimental/hierarchy/core/Instance.scala
+++ b/core/src/main/scala/chisel3/experimental/hierarchy/core/Instance.scala
@@ -5,7 +5,7 @@ package chisel3.experimental.hierarchy.core
 import scala.language.experimental.macros
 import chisel3._
 import chisel3.experimental.hierarchy.{InstantiableClone, ModuleClone}
-import chisel3.internal.{throwException, Builder, PseudoModule}
+import chisel3.internal.{throwException, Builder}
 import chisel3.experimental.{BaseModule, ExtModule, SourceInfo}
 import chisel3.internal.sourceinfo.InstanceTransform
 import chisel3.internal.firrtl.{Component, DefBlackBox, DefIntrinsicModule, DefModule, Port}
@@ -130,7 +130,7 @@ object Instance extends SourceInfoDoc {
           "Imported Definition information not found - possibly forgot to add ImportDefinition annotation?"
         )
       )
-      class EmptyExtModule extends ExtModule with PseudoModule {
+      class EmptyExtModule extends ExtModule {
         override def desiredName: String = extModName
         override private[chisel3] def _isImportedDefinition = true
         override def generateComponent(): Option[Component] = {