In his book Struktura rewolucji relatywistycznej i kwantowej w fizyce [The Structure of Relativistic and Quantum Revolution in Physics] Wojciech Sady presents a view on the thesis of underdetermination, according to which it should be regarded as a pseudoproblem of contemporary philosophy of science. I reject this view and suggest that Sady’s argumentation against the thesis of underdetermination is tantamount to attacking a straw man. This is because he argues against its correctness by pointing to the incorrectness of the conclusions he unjustifiably draws from it.