Index: src/Parser/TypeData.cpp
===================================================================
--- src/Parser/TypeData.cpp	(revision 7f18438f6ced55ef03d1637ee81da566c4cbb844)
+++ src/Parser/TypeData.cpp	(revision 830edc615fda3f16d44327cfaf8827106141df2d)
@@ -1454,5 +1454,9 @@
 	assert( td->kind == TypeData::Aggregate );
 	assert( td->aggregate.kind == ast::AggregateDecl::Enum );
-	ast::Type * baseType = td->base ? typebuild(td->base) : nullptr;
+	ast::ptr<ast::Type> baseType = td->base ? typebuild(td->base) : nullptr;
+	if ( baseType ) {
+		ast::add_qualifiers( baseType, ast::CV::Qualifiers( ast::CV::Const ));
+	}
+
 	ast::EnumDecl * ret = new ast::EnumDecl(
 		td->location,