diff --git a/compiler/src/dotty/tools/dotc/ast/DesugarEnums.scala b/compiler/src/dotty/tools/dotc/ast/DesugarEnums.scala
index 787d206dbf49..822dce008b45 100644
--- a/compiler/src/dotty/tools/dotc/ast/DesugarEnums.scala
+++ b/compiler/src/dotty/tools/dotc/ast/DesugarEnums.scala
@@ -99,7 +99,7 @@ object DesugarEnums {
     val privateValuesDef =
       ValDef(nme.DOLLAR_VALUES, TypeTree(),
         New(TypeTree(defn.EnumValuesClass.typeRef.appliedTo(enumClass.typeRef :: Nil)), ListOfNil))
-        .withFlags(Private)
+        .withFlags(Private | Synthetic)
 
     val valuesOfExnMessage = Apply(
       Select(Literal(Constant("key not found: ")), "concat".toTermName),