diff --git a/lib/motion/project/template/ios/config.rb b/lib/motion/project/template/ios/config.rb
index ee9d3d1b..2965b08f 100644
--- a/lib/motion/project/template/ios/config.rb
+++ b/lib/motion/project/template/ios/config.rb
@@ -52,8 +52,11 @@ module Motion; module Project;
 
     def archs
       @archs ||= begin
+        # By default, do not build with 64-bit, as it's still experimental.
         # No longer build for armv7s by default.
         archs = super
+        archs['iPhoneSimulator'].delete('x86_64')
+        archs['iPhoneOS'].delete('arm64')
         archs['iPhoneOS'].delete('armv7s')
         archs
       end