A pinned interlock between courses eliminates the need for wall units to have protrusions, lips or tongues. As a result, geogrid lays flat between courses of units. This simplifies installation of geogrid and avoids damage to the grid that can occur when it is wrapped around or otherwise forced to conform to a protrusion. Pin connections also provide a positive mechanical connection to geogrids, even when there is little friction between units, such as in seismic events. Without modifications, unit protrusions and lips can change setback in curved walls. Pinned VERSA-LOK wall units can maintain consistent setback in both straight and curved sections of walls without modification.