This paper considers the (short-run) employment and wage effects of the 2004 EU enlargement on firms located close to Germany's eastern border. We use a 50% sample of Germans plants and apply difference-in-differences estimators combined with a matching approach. We evaluate changes in total employment, the employment shares of low-skilled and East European workers and the wages for low-skilled, skilled and high-skilled workers in various sectors. Our results suggest basically no short-run employment effects of the EU enlargement except for firms active in wholesale and retail trade, hotels and restaurants. We also find some evidence for a stronger employment of East European workers in almost all border firms, although the effects are quantitatively small. Negative wage effects are only found for skilled workers in consulting, research and related activities.