diff --git a/os/rt/ports/ARMCMx/compilers/GCC/chcoreasm_v7m.s_ b/os/rt/ports/ARMCMx/compilers/GCC/chcoreasm_v7m.S
similarity index 100%
rename from os/rt/ports/ARMCMx/compilers/GCC/chcoreasm_v7m.s_
rename to os/rt/ports/ARMCMx/compilers/GCC/chcoreasm_v7m.S