diff --git a/compiler/src/dotty/tools/dotc/fromtasty/TASTYCompiler.scala b/compiler/src/dotty/tools/dotc/fromtasty/TASTYCompiler.scala
index 80184d05317b..38340ae3e0b3 100644
--- a/compiler/src/dotty/tools/dotc/fromtasty/TASTYCompiler.scala
+++ b/compiler/src/dotty/tools/dotc/fromtasty/TASTYCompiler.scala
@@ -19,6 +19,6 @@ class TASTYCompiler extends Compiler {
 
   override def newRun(implicit ctx: Context): Run = {
     reset()
-    new TASTYRun(this, ctx)
+    new TASTYRun(this, ctx.addMode(Mode.ReadPositions))
   }
 }