It is well known that one of the most significant errors in GPS pseudo-range measurement is the multipath error. Many researchers have been involved this major issue and promising results have been achieved in mitigating multipath errors. Most of these studies, however, do not really improve the tracking error in presence of short multipath. This paper addresses a novel code loop discriminator which is insensitive to multipath signals having a relative delay lower than one half the correlator spacing. The benefit of this discriminator, called Short-Multipath Insensitive Code Loop (SMICL) discriminator, has been evaluated theoretically and implemented using MatLab/Simulink. The proposed method requires neither hardware nor software complexity. The novel loop tracking error as well as the Narrow Correlator (NC) one were determined and compared. Simulation results showed that the proposed code discriminator outperforms the narrow correlator one in terms of simplicity and performance.