A four-stroke internal combustion engine comprising at least one cylinder arrangement , a crankshaft , an exhaust camshaft , an intake camshaft , a turbocharger , and a control system , wherein the cylinder arrangement comprises a combustion chamber , a cylinder bore , a piston configured to reciprocate in the cylinder bore and being connected to the crankshaft , an exhaust valve , and an intake valve , wherein the exhaust camshaft is configured to control the opening and closing of the exhaust valve , and the intake camshaft is configured to control the opening and closing of the intake valve , wherein the turbocharger comprises a compressor and a turbine , the turbine being arranged in an exhaust gas flow path extending from the exhaust valve , wherein a timing of the exhaust camshaft and a timing of the intake camshaft are controllable by the control system , wherein the control system is configured to: - store a compressor map related to the compressor of the turbocharger , - store a reference area within the compressor map - determine at least two parameters out of: a current turbocharger rotational speed, a current charge air mass flow, and one of a current charge air pressure or a current compressor pressure ratio, and in response to the at least two parameters indicating that a current operational point of the compressor is outside the reference area at a higher charge air mass flow (m' op ) than a maximum charge air mass flow (m' max ) of the reference area at a compressor pressure ratio (p op :p) of the current operational point , - change the timing of the exhaust camshaft to advance closing of the exhaust valve , and - change the timing of the intake camshaft to delay opening of the intake valve . the cylinder arrangement comprises a combustion chamber , a cylinder bore , a piston configured to reciprocate in the cylinder bore and being connected to the crankshaft , an exhaust valve , and an intake valve , wherein the exhaust camshaft is configured to control the opening and closing of the exhaust valve , and the intake camshaft is configured to control the opening and closing of the intake valve , wherein the turbocharger comprises a compressor and a turbine , the turbine being arranged in an exhaust gas flow path extending from the exhaust valve , wherein a timing of the exhaust camshaft and a timing of the intake camshaft are controllable by the control system , wherein the control system is configured to: - store a compressor map related to the compressor of the turbocharger , - store a reference area within the compressor map - determine at least two parameters out of: a current turbocharger rotational speed, a current charge air mass flow, and one of a current charge air pressure or a current compressor pressure ratio, - store a compressor map related to the compressor of the turbocharger , - store a reference area within the compressor map - determine at least two parameters out of: a current turbocharger rotational speed, a current charge air mass flow, and one of a current charge air pressure or a current compressor pressure ratio, and in response to the at least two parameters indicating that a current operational point of the compressor is outside the reference area at a higher charge air mass flow (m' op ) than a maximum charge air mass flow (m' max ) of the reference area at a compressor pressure ratio (p op :p) of the current operational point , - change the timing of the exhaust camshaft to advance closing of the exhaust valve , and - change the timing of the intake camshaft to delay opening of the intake valve . - change the timing of the exhaust camshaft to advance closing of the exhaust valve , and - change the timing of the intake camshaft to delay opening of the intake valve . <EOS>