diff --git a/compiler/src/dotty/tools/io/ZipArchive.scala b/compiler/src/dotty/tools/io/ZipArchive.scala
index 3a4d32614c82..9af935690ffc 100644
--- a/compiler/src/dotty/tools/io/ZipArchive.scala
+++ b/compiler/src/dotty/tools/io/ZipArchive.scala
@@ -160,7 +160,7 @@ final class FileZipArchive(jpath: JPath, release: Option[String]) extends ZipArc
     override def sizeOption: Option[Int] = Some(zipEntry.getSize.toInt)
   }
 
-  @volatile lazy val (root, allDirs): (DirEntry, collection.Map[String, DirEntry]) = {
+  lazy val (root, allDirs): (DirEntry, collection.Map[String, DirEntry]) = {
     val root = new DirEntry("/", null)
     val dirs = mutable.HashMap[String, DirEntry]("/" -> root)
     val zipFile = openZipFile()
diff --git a/sbt-test/sbt-dotty/scaladoc/src/main/scala/AutoParamTupling.scala b/sbt-test/sbt-dotty/scaladoc/src/main/scala/AutoParamTupling.scala
index 3636fd218ca3..7010a43a5107 100644
--- a/sbt-test/sbt-dotty/scaladoc/src/main/scala/AutoParamTupling.scala
+++ b/sbt-test/sbt-dotty/scaladoc/src/main/scala/AutoParamTupling.scala
@@ -11,7 +11,7 @@ object AutoParamTupling {
       * In order to get thread safety, you need to put @volatile before lazy vals.
       * https://dotty.epfl.ch/docs/reference/changed-features/lazy-vals.html
       */
-    @volatile lazy val xs: List[String] = List("d", "o", "t", "t", "y")
+    lazy val xs: List[String] = List("d", "o", "t", "t", "y")
 
     /**
       * Current behaviour in Scala 2.12.2 :