After the Bolshevik takeover, Fertner returned to Poland. He appeared in only 2 films in the 1920s. However, the popularity of musical comedy mixed with his forte, farce comedy, he revived his career. During the 1930s, he appeared in over 15 films, including many important classic Polish musical comedies such as "Ada! Don't Do That" (1936) and "The Forgotten Melody" (1938).