Rectangular baler comprising a bale chamber (201) adapted to contain one or more bales a compacting plunger (203) for advancing crop material in a discharge direction (F) towards a discharge opening of the bale chamber wherein at least one friction block (207, 307, 307, 307") is fixed on an inner side of a wall of the bale chamber the or each friction block comprising a wedge shaped part (211, 311, 311, 311") having an inclined surface (213, 313, 313, 313") extending from the inner side of the wall in the discharge direction (F).
