diff --git a/products/llbuildSwift/CMakeLists.txt b/products/llbuildSwift/CMakeLists.txt
index 918bde56..677a103f 100644
--- a/products/llbuildSwift/CMakeLists.txt
+++ b/products/llbuildSwift/CMakeLists.txt
@@ -15,9 +15,14 @@ if(CMAKE_VERSION VERSION_LESS 3.16)
   endif()
 endif()
 
+# Set x86_64 default if CMAKE_OSX_ARCHITECTURES is not set
+if(NOT DEFINED CMAKE_OSX_ARCHITECTURES)
+  set(CMAKE_OSX_ARCHITECTURES "x86_64")
+endif()
+
 # TODO(compnerd) move both of these outside of the CMake into the invocation
 if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
-  add_compile_options(-target x86_64-apple-macosx10.10)
+  add_compile_options(-target ${CMAKE_OSX_ARCHITECTURES}-apple-macosx10.10)
   if(NOT CMAKE_OSX_SYSROOT STREQUAL "")
     add_compile_options(-sdk ${CMAKE_OSX_SYSROOT})
   endif()