A shelving unit includes front and rear shelf supporting beams, each beam including an upper shelf supporting flange that defines a shelf seat and a lower flange spaced from the upper flange, a shelf configured to be positioned in the seat defined by the front and rear shelf support beams, and at least one tie clip configured to be connected to the shelving unit between the shelf and the lower flange of at least one of the front and rear shelf supporting beams. A method of assembling a shelving unit is also disclosed.