diff --git a/compiler/test/dotty/tools/dotc/core/tasty/CommentPicklingTest.scala b/compiler/test/dotty/tools/dotc/core/tasty/CommentPicklingTest.scala
index 4cafc1673027..e890c1c3b1d9 100644
--- a/compiler/test/dotty/tools/dotc/core/tasty/CommentPicklingTest.scala
+++ b/compiler/test/dotty/tools/dotc/core/tasty/CommentPicklingTest.scala
@@ -110,7 +110,7 @@ class CommentPicklingTest {
       implicit val (_, ctx: Context) = setup(args, initCtx)
       ctx.initialize()
       val trees = files.flatMap { f =>
-        val unpickler = new DottyUnpickler(f.bytes().toArray)
+        val unpickler = new DottyUnpickler(f.toByteArray())
         unpickler.enter(roots = Set.empty)
         unpickler.trees(ctx)
       }