diff --git a/lib/motion/project/builder.rb b/lib/motion/project/builder.rb
index d44621e7..45b3817f 100644
--- a/lib/motion/project/builder.rb
+++ b/lib/motion/project/builder.rb
@@ -127,7 +127,7 @@ module Motion; module Project;
               else
                 arch
             end
-            sh "/usr/bin/env VM_KERNEL_PATH=\"#{kernel}\" VM_OPT_LEVEL=\"#{config.opt_level}\" /usr/bin/arch -arch #{compiler_exec_arch} #{ruby} #{rubyc_bs_flags} --emit-llvm \"#{asm}\" #{init_func} \"#{path}\""
+            sh "/usr/bin/env VM_PLATFORM=\"#{platform}\" VM_KERNEL_PATH=\"#{kernel}\" VM_OPT_LEVEL=\"#{config.opt_level}\" /usr/bin/arch -arch #{compiler_exec_arch} #{ruby} #{rubyc_bs_flags} --emit-llvm \"#{asm}\" #{init_func} \"#{path}\""
 
             # Object 
             arch_obj = File.join(files_build_dir, "#{path}.#{arch}.o")