1 files changed, 4 insertions, 2 deletions
diff --git a/src/main/scala/firrtl/options/phases/WriteOutputAnnotations.scala b/src/main/scala/firrtl/options/phases/WriteOutputAnnotations.scala
index 2d226de1..7d857108 100644
--- a/src/main/scala/firrtl/options/phases/WriteOutputAnnotations.scala
+++ b/src/main/scala/firrtl/options/phases/WriteOutputAnnotations.scala
@@ -4,7 +4,7 @@ package firrtl.options.phases
 
 import firrtl.AnnotationSeq
 import firrtl.annotations.{DeletedAnnotation, JsonProtocol}
-import firrtl.options.{Phase, PreservesAll, StageOptions, Unserializable, Viewer}
+import firrtl.options.{Phase, StageOptions, Unserializable, Viewer}
 import firrtl.options.Dependency
 
 import java.io.PrintWriter
@@ -12,7 +12,7 @@ import java.io.PrintWriter
 /** [[firrtl.options.Phase Phase]] that writes an [[AnnotationSeq]] to a file. A file is written if and only if a
   * [[StageOptions]] view has a non-empty [[StageOptions.annotationFileOut annotationFileOut]].
   */
-class WriteOutputAnnotations extends Phase with PreservesAll[Phase] {
+class WriteOutputAnnotations extends Phase {
 
   override def prerequisites =
     Seq( Dependency[GetIncludes],
@@ -22,6 +22,8 @@ class WriteOutputAnnotations extends Phase with PreservesAll[Phase] {
 
   override def optionalPrerequisiteOf = Seq.empty
 
+  override def invalidates(a: Phase) = false
+
   /** Write the input [[AnnotationSeq]] to a fie. */
   def transform(annotations: AnnotationSeq): AnnotationSeq = {
     val sopts = Viewer[StageOptions].view(annotations)