The invention relates to a device for cooling a gas flow of an internal combustion engine, comprising a housing (1), an inlet (3) and an outlet (4) for a gas, in particular exhaust gas and/or charge air of the internal combustion engine, which is to be cooled, an inlet (18) and an outlet (16) for an in particular liquid coolant, an exchanger means (5) for heat transfer between the gas and the coolant, a first wall section (1 a) of the housing (1), wherein the first wall section (1 a) is arranged between the coolant and the gas flow, and a second wall section (1 b) of the housing (1), wherein the second wall section (1 b) is arranged between the coolant and an environment, in particular the atmosphere, wherein the first wall section (1 a) and the second wall section (1 b) are materially integrally formed in one piece.