The Austrian Beveridge curve shifted in 2014, leading to ongoing academic discussions about the reasons behind this shift. While some have argued that the shift was caused by a supply shock due to labour market liberalization, others have stated that matching efficiency decreased. Using a new decomposition method, combined with detailed labour market flow data, we are the first to disentangle supply-side, demand-side and matching factors, which could potentially cause a shift in the Beveridge curve in Austria. We find empirical evidence to confirm that the increase in the unemployment rate in Austria after 2011 can indeed be attributed to a supply-side shock. But, contrary to other research, our analysis shows that the shift in the Beveridge curve after 2014 was mainly caused by a decrease in matching efficiency, indicating a rising mismatch problem in the Austrian labour market.