A clamping spring of a conductor connection terminal for connecting an electrical conductor by means of spring-loaded clamping, wherein the clamping spring has a support leg to fix the clamping spring in the conductor connection terminal, a spring bend adjoining the support leg, and a clamping leg adjoining the spring bend, wherein the clamping leg is arranged to clamp the electrical conductor by means of its free end, wherein the clamping leg has at least one corrugation stamped into the material of the clamping leg. A conductor connection terminal with such a clamping spring is also provided.