The reflection coefficient for a small‐amplitude second sound wave reflected by a large‐amplitude first sound wave front is derived. This type of reflection is unique in that the discontinuity (the first sound wave) travels faster than the wave being reflected. Hence, the discontinuity can overtake the second sound wave from behind. It is shown that the principal term in the reflection coefficient is due to the particle velocity associated with a pressure wave. This reflection coefficient is positive when the discontinuity overtakes the second sound wave from behind and negative when the discontinuity and the second sound wave are approaching one another head‐on. The reflection coefficient for a small‐amplitude first sound wave reflected by a large‐amplitude second sound wave front is also derived.