Prevent Flatten from stripping all annotations (#1024)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main/scala/firrtl/transforms/Flatten.scala b/src/main/scala/firrtl/transforms/Flatten.scala
index 6654667a..a94f5d5a 100644
--- a/src/main/scala/firrtl/transforms/Flatten.scala
+++ b/src/main/scala/firrtl/transforms/Flatten.scala
@@ -104,7 +104,7 @@ class Flatten extends Transform {
    override def execute(state: CircuitState): CircuitState = {
      val annos = state.annotations.collect { case a @ FlattenAnnotation(_) => a }
      annos match {
-       case Nil => CircuitState(state.circuit, state.form)
+       case Nil => state
        case myAnnotations =>
          val c = state.circuit
          val (modNames, instNames) = collectAnns(state.circuit, myAnnotations)