diff --git a/compiler/src/dotty/tools/dotc/core/Types.scala b/compiler/src/dotty/tools/dotc/core/Types.scala
index 04dfbbb26ef7..965ef4ecfd9c 100644
--- a/compiler/src/dotty/tools/dotc/core/Types.scala
+++ b/compiler/src/dotty/tools/dotc/core/Types.scala
@@ -1373,7 +1373,7 @@ object Types {
           Atoms.Range(set, set)
         else Atoms.Unknown
 
-      dealias match
+      dealias.normalized match
         case tp: SingletonType =>
           tp.underlying.atoms match
             case as @ Atoms.Range(lo, hi) =>