1 files changed, 4 insertions, 2 deletions
diff --git a/src/main/scala/firrtl/transforms/RemoveKeywordCollisions.scala b/src/main/scala/firrtl/transforms/RemoveKeywordCollisions.scala
index c7ed6688..c5f20363 100644
--- a/src/main/scala/firrtl/transforms/RemoveKeywordCollisions.scala
+++ b/src/main/scala/firrtl/transforms/RemoveKeywordCollisions.scala
@@ -10,7 +10,7 @@ import firrtl.ir
 import firrtl.passes.{Uniquify, PassException}
 import firrtl.Utils.v_keywords
 import firrtl.Mappers._
-import firrtl.options.{Dependency, PreservesAll}
+import firrtl.options.Dependency
 
 import scala.collection.mutable
 
@@ -231,7 +231,7 @@ class RemoveKeywordCollisions(keywords: Set[String]) extends Transform with Depe
 }
 
 /** Transform that removes collisions with Verilog keywords */
-class VerilogRename extends RemoveKeywordCollisions(v_keywords) with PreservesAll[Transform] {
+class VerilogRename extends RemoveKeywordCollisions(v_keywords) {
 
   override def prerequisites = firrtl.stage.Forms.LowFormMinimumOptimized ++
     Seq( Dependency[BlackBoxSourceHelper],
@@ -247,4 +247,6 @@ class VerilogRename extends RemoveKeywordCollisions(v_keywords) with PreservesAl
 
   override def optionalPrerequisiteOf = Seq.empty
 
+  override def invalidates(a: Transform) = false
+
 }