The design of a Geosynthetic Reinforced Soil (GRS) wall for internal stability against pullout failure requires computing the reinforcement embedment length. Therefore, the location of failure plane is an important input for this design. The current FHWA MSE wall design guidelines assume the location of failure plane based on Rankine theory. While this assumption holds true for conventional walls it is unconservative for GRS walls under constrained spaces, also known as "narrow GRS walls". This paper presents a limit equilibrium study to accurately locate failure planes within narrow GRS walls.