Croatia's EU accession of July 2013 may have significant impacts on neibouring exporters such as Bosnia and Herzegovina. Each EU member state is obliged to comply with various EU standards based on the Acquis Communautaire. In the accession process, Croatia pursued institutional reforms in agriculture and food sectors, among others, under the direction of Brussels. Upon Slovenia's EU accession in 2004, Croatia's agricultural sector saw a same problem as today's Bosnia. This paper examines the negative effects of EU standards on trade flows between Croatia (then a non-EU member) and Slovenia (EU-accessing state) with particular reference to agricultural export from the former. The analysis implies that the EU standards duly discourage trade flows of non-compliant agricultural and food sectors. The implications to relatively agriculture-dependent Bosnia are significant in terms of possible unemployment and social stability. But in the medium and longer term, the effort to comply with the standards can pay, like Croatia.