This article concentrates on the problem of gender wage gap in Poland. The raw gap over the period 1995-2011 amounts to app. 10%. However, accounting for the differences in endowments the actual wage gap grows to as much as 20%. We implemented both parametric and nonparametric decomposition techniques to test the reliability of this result and employed a number of robustness checks. While there is some heterogeneity between groups with different educational attainments, skills and of different age - the adjusted wage gap roughly doubles the raw wage gap. Despite covering already 17 years of data, we were not able to identify any clear decreasing trend in gender discrimination in Poland.