diff --git a/detectplatform.cmake b/detectplatform.cmake
index 7b93bbf..6fa6e9e 100644
--- a/detectplatform.cmake
+++ b/detectplatform.cmake
@@ -56,7 +56,11 @@ endif(CMAKE_SYSTEM_NAME STREQUAL Linux)
 
 if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
   set(CLR_CMAKE_PLATFORM_UNIX 1)
-  set(CLR_CMAKE_PLATFORM_UNIX_AMD64 1)
+  if(CMAKE_SYSTEM_PROCESSOR STREQUAL arm64)
+     set(CLR_CMAKE_PLATFORM_UNIX_ARM64 1)
+   else()
+     set(CLR_CMAKE_PLATFORM_UNIX_AMD64 1)
+   endif()
   set(CLR_CMAKE_PLATFORM_DARWIN 1)
   if(CMAKE_VERSION VERSION_LESS "3.4.0")
     set(CMAKE_ASM_COMPILE_OBJECT "${CMAKE_C_COMPILER} <FLAGS> <DEFINES> -o <OBJECT> -c <SOURCE>")