Permissibility of walking between safa and marwa

assalaamualaykum muftisaab.hope you are in the best of health.please answer my question urgently.i am leaving for ummrah in 3weeks time. all i want to know is that i have an injury to my knee and walk normal but unable to run.what is my position when doing saafa and saaee one is supposed to run between green lights which i am unable to do.am i allowed to do a brisk walk between the lights.i have been for ummrah before and ran between the lights.wassalaam.