Change pawn's movement speed

Hi!

I’m trying to modify the movement speed of a pawn with this:

AddMovementInput(FRotationMatrix(control_rot).GetScaledAxis(EAxis::X), axis_value * m_free_movement_speed);

But it doesn’t work.

The pawn has a UPawnMovementComponent * m_movement_component; declared.

How can I change pawn’s movement speed?

Thanks.