diff --git a/tools/cmake/cores/Cortex-M0.cmake b/tools/cmake/cores/Cortex-M0.cmake
index 626e1a985b..68d00b726a 100644
--- a/tools/cmake/cores/Cortex-M0.cmake
+++ b/tools/cmake/cores/Cortex-M0.cmake
@@ -5,6 +5,7 @@
 if(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")
     list(APPEND common_options
         "-mthumb"
+        "-mcpu=cortex-m0"
     )
 elseif(${MBED_TOOLCHAIN} STREQUAL "ARM")
     list(APPEND c_cxx_compile_options