The high number of possible variants of software product lines raises a considerable practical challenge in testing. In this paper we report our experience with a simple approach that reuses existing automated system tests of a specific product variant to increase the coverage of new variants with little extra effort. The approach has been developed and applied for a soft-ware product line in a mechanical engineering company. The existing 300 automated regression tests have been reused on ten new product variants. The results showed that the proposed ap-proach successfully accomplished to increase the test coverage.