The invention relates to an internal combustion engine system. The system comprises an internal combustion engine (10), a first turbine unit (100) receiving exhaust gases from the internal combustion engine (10), said turbine unit (100) having a compressor (110) for compressing intake air and feeding said intake air by means of an air intake line (20) to said internal combustion engine (10), and an exhaust gas recirculation line (200) connecting said air intake line (20) with an exhaust gas line (30) of the internal combustion engine (10) at a position upstream the first turbine unit (100). A bypass line (300) connects the exhaust gas recirculation line (200) to the exhaust gas line (30) at a position downstream of the turbine unit (100), said bypass line (300) having means (310) for controlling the exhaust gas flow from the exhaust gas recirculation line (200) to the exhaust gas line (30).