1 files changed, 3 insertions, 1 deletions
diff --git a/tool/insns2vm.rb b/tool/insns2vm.rb
index e6fe64d189..8117b789fb 100755
--- a/tool/insns2vm.rb
+++ b/tool/insns2vm.rb
@@ -8,6 +8,8 @@ require_relative 'ruby_vm/scripts/insns2vm'
 if $0 == __FILE__
   router(ARGV).each do |(path, generator)|
     str = generator.generate path
-    path.write str, mode: 'wb:utf-8'
+    path.open 'wb:utf-8' do |fp|
+      fp.write str
+    end
   end
 end