1 files changed, 1 insertions, 1 deletions
diff --git a/src/compiler/scala/tools/nsc/transform/SpecializeTypes.scala b/src/compiler/scala/tools/nsc/transform/SpecializeTypes.scala
index 343f95782e..0cd7f516ef 100644
--- a/src/compiler/scala/tools/nsc/transform/SpecializeTypes.scala
+++ b/src/compiler/scala/tools/nsc/transform/SpecializeTypes.scala
@@ -424,7 +424,7 @@ abstract class SpecializeTypes extends InfoTransform with TypingTransformers {
   def specializedTypeVars(tpe: Type): immutable.Set[Symbol] = tpe match {
     case TypeRef(pre, sym, args) =>
       if (sym.isAliasType)
-        specializedTypeVars(tpe.normalize)
+        specializedTypeVars(tpe.dealiasWiden)
       else if (sym.isTypeParameter && sym.isSpecialized || (sym.isTypeSkolem && sym.deSkolemize.isSpecialized))
         Set(sym)
       else if (sym == ArrayClass)