Wind deflector assembly intended for use in front of a roof opening of an open roof construction for a vehicle, the open roof construction comprising a stationary part and a panel capable of closing the roof opening and at least partly opening it, wherein the wind deflector assembly is capable of moving between a retracted position below the roof opening and an extended position above the roof opening and comprises: a wind deflector member which extends in a transverse direction of the vehicle and which is connected at an upper end to an elongated member and at an opposite lower end to the stationary part, a pair of wind deflector arms (7, 7') each connected at a first end (8, 8') to one of the opposite ends of the elongated member and at a second end (9, 9') to the stationary part by means of a slidable hinge (10,10'), wherein the wind deflector assembly is biased by means of a spring (11, 11') in a rearward longitudinal direction, said spring (11, 11') being connected to the second end (9, 9`) of each wind deflector arm (5, 5'), wherein a biasing device (12, 12') engages each wind deflector arm (7, 7') and urges the wind deflector arm (7, 7') towards the extended position, wherein the biasing device (12, 12') comprises first and second legs (13, 13'; 14, 14') integrally connected to each other at first ends (15, 15') of the first and second legs (13, 13'; 14, 14'), the first leg (13, 13') extending between the wind deflector arm (7, 7') and the stationary part so as to urge the wind deflector arm (7, 7') towards the extended position in cooperation with the second leg, and wherein the second leg (14,14') of the biasing device (12, 12') is engaged with and extends substantially along at least a part of the wind deflector arm (7, 7'), wherein a second end (16, 16') of the first leg (13, 13') is only pivotally connected with regard to the stationary part, wherein the first leg (13, 13') is the only biasing connection of the biasing device (12, 12') extending between the stationary part and the wind deflector arm (7, 7') in such a way that the force for urging the wind deflector assembly towards the extended position is formed by only the first leg (13, 13'). a wind deflector member which extends in a transverse direction of the vehicle and which is connected at an upper end to an elongated member and at an opposite lower end to the stationary part, a pair of wind deflector arms (7, 7') each connected at a first end (8, 8') to one of the opposite ends of the elongated member and at a second end (9, 9') to the stationary part by means of a slidable hinge (10,10'), wherein the wind deflector assembly is biased by means of a spring (11, 11') in a rearward longitudinal direction, said spring (11, 11') being connected to the second end (9, 9`) of each wind deflector arm (5, 5'), wherein a biasing device (12, 12') engages each wind deflector arm (7, 7') and urges the wind deflector arm (7, 7') towards the extended position, wherein the biasing device (12, 12') comprises first and second legs (13, 13'; 14, 14') integrally connected to each other at first ends (15, 15') of the first and second legs (13, 13'; 14, 14'), the first leg (13, 13') extending between the wind deflector arm (7, 7') and the stationary part so as to urge the wind deflector arm (7, 7') towards the extended position in cooperation with the second leg, and wherein the second leg (14,14') of the biasing device (12, 12') is engaged with and extends substantially along at least a part of the wind deflector arm (7, 7'), wherein a second end (16, 16') of the first leg (13, 13') is only pivotally connected with regard to the stationary part, wherein the first leg (13, 13') is the only biasing connection of the biasing device (12, 12') extending between the stationary part and the wind deflector arm (7, 7') in such a way that the force for urging the wind deflector assembly towards the extended position is formed by only the first leg (13, 13').