diff --git a/CMakeLists.txt b/CMakeLists.txt
index 997bfd51f6..ece221632f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -708,21 +708,15 @@ target_link_libraries(zigcpp LINK_PUBLIC
     ${CMAKE_THREAD_LIBS_INIT}
 )
 
-if(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "AMD64")
+string(TOLOWER "${CMAKE_HOST_SYSTEM_PROCESSOR}" HOST_TARGET_ARCH)
+if(HOST_TARGET_ARCH STREQUAL "amd64")
   set(HOST_TARGET_ARCH "x86_64")
-elseif(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "amd64")
-  set(HOST_TARGET_ARCH "x86_64")
-elseif(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "arm64")
+elseif(HOST_TARGET_ARCH STREQUAL "arm64")
   set(HOST_TARGET_ARCH "aarch64")
-elseif(CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "ARM64")
-  set(HOST_TARGET_ARCH "aarch64")
-else()
-  string(TOLOWER "${CMAKE_HOST_SYSTEM_PROCESSOR}" HOST_TARGET_ARCH)
 endif()
-if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
+string(TOLOWER "${CMAKE_HOST_SYSTEM_NAME}" HOST_TARGET_OS)
+if(HOST_TARGET_OS STREQUAL "darwin")
   set(HOST_TARGET_OS "macos")
-else()
-  string(TOLOWER "${CMAKE_HOST_SYSTEM_NAME}" HOST_TARGET_OS)
 endif()
 set(HOST_TARGET_TRIPLE "${HOST_TARGET_ARCH}-${HOST_TARGET_OS}")