A clip for coupling a first wall panel comprising a first joiner and a core adjacent to the first joiner and a second wall panel comprising a second joiner includes a longitudinal wall, a vertical wall perpendicular coupled to the longitudinal wall, a recessed wall coupled to the vertical wall and a retaining wall coupled to the recessed wall extending from the recessed wall. The vertical wall, the recessed wall and said retaining wall extend into a channel formed by the second joiner. An insert wall extends from the longitudinal wall and is sized to be received outside the first channel.