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-rw-r--r--core/src/main/scala/chisel3/internal/Builder.scala2
1 files changed, 1 insertions, 1 deletions
diff --git a/core/src/main/scala/chisel3/internal/Builder.scala b/core/src/main/scala/chisel3/internal/Builder.scala
index e1e4d460..35c4bdf9 100644
--- a/core/src/main/scala/chisel3/internal/Builder.scala
+++ b/core/src/main/scala/chisel3/internal/Builder.scala
@@ -84,7 +84,7 @@ trait InstanceId {
private[chisel3] trait HasId extends InstanceId {
private[chisel3] def _onModuleClose: Unit = {}
- private[chisel3] val _parent: Option[BaseModule] = Builder.currentModule
+ private[chisel3] var _parent: Option[BaseModule] = Builder.currentModule
private[chisel3] val _id: Long = Builder.idGen.next