Unreinforced brick masonry walls (URM) have been widely used in construction for centuries and represent a large part of building heritage. However, these walls are prone to cracking and failure under certain loading conditions. Addressing this issue requires a comprehensive understanding of URM structures and the implementation of effective retrofitting techniques to enhance their structural integrity. wherefore, researchers have proposed the use of thin Fiber reinforced mortar coating as a reinforcement technique. This experimental study aims to investigate the effectiveness of this approach in improving the behavior of perforated brick masonry walls. To carry out this investigation, a shear triplets test under uniaxial loading has been conducted to evaluate the performance of the reinforcement technique. A series of shear triplets were built with perforated masonry of dimensions (220 x110 × 55) using bastard mortar (1: 1: 5). These specimens were coated with a thin layer of polypropylene fiber reinforced mortar. The test results of the reinforced and unreinforced specimens were compared to analyze the effectiveness of this technique of reinforcement. The test results showed that the application of fiber reinforced coating significantly increased the deformation ability and improved the stiffness and the bond strength of the masonry walls.