Index: src/Tuples/TupleExpansion.cc
===================================================================
--- src/Tuples/TupleExpansion.cc	(revision 6bbce58bd62e0b1ff16a394dfb2a320dcf9ca898)
+++ src/Tuples/TupleExpansion.cc	(revision f5c3b6cd1ad780487cd91b5ea931a57c5158864d)
@@ -204,5 +204,5 @@
 			decl->set_body( true );
 			for ( size_t i = 0; i < tupleSize; ++i ) {
-				TypeDecl * tyParam = new TypeDecl( toString( "tuple_param_", tupleSize, "_", i ), Type::StorageClasses(), nullptr, TypeDecl::Any );
+				TypeDecl * tyParam = new TypeDecl( toString( "tuple_param_", tupleSize, "_", i ), Type::StorageClasses(), nullptr, TypeDecl::Dtype, true );
 				decl->get_members().push_back( new ObjectDecl( toString("field_", i ), Type::StorageClasses(), LinkageSpec::C, nullptr, new TypeInstType( Type::Qualifiers(), tyParam->get_name(), tyParam ), nullptr ) );
 				decl->get_parameters().push_back( tyParam );