diff --git a/tool/ruby_vm/controllers/application_controller.rb b/tool/ruby_vm/controllers/application_controller.rb
index 65783513e7..ba8f15a0c1 100644
--- a/tool/ruby_vm/controllers/application_controller.rb
+++ b/tool/ruby_vm/controllers/application_controller.rb
@@ -18,7 +18,7 @@ require_relative '../loaders/vm_opts_h'
 class ApplicationController
   def generate i, destdir
     path = Pathname.new i
-    dst = Pathname.new(destdir).join(i)
+    dst = destdir ? Pathname.new(destdir).join(i) : Pathname.new(i)
     dumper = RubyVM::Dumper.new dst
     return [path, dumper]
   end
diff --git a/tool/ruby_vm/helpers/dumper.rb b/tool/ruby_vm/helpers/dumper.rb
index ccd5717cc8..ae2a0145cf 100644
--- a/tool/ruby_vm/helpers/dumper.rb
+++ b/tool/ruby_vm/helpers/dumper.rb
@@ -25,7 +25,7 @@ class RubyVM::Dumper
   end
 
   def new_erb spec
-    path  = Pathname.new(__FILE__).realpath.dirname
+    path  = Pathname.new(__FILE__).relative_path_from(Pathname.pwd).dirname
     path += '../views'
     path += spec
     src   = path.read mode: 'rt:utf-8:utf-8'
@@ -37,7 +37,7 @@ class RubyVM::Dumper
     else
       erb = ERB.new(src, nil, '%-')
     end
-    erb.filename = path.realpath.to_path
+    erb.filename = path.to_path
     return erb
   end
 
@@ -87,7 +87,7 @@ class RubyVM::Dumper
   def initialize dst
     @erb   = {}
     @empty = new_binding
-    @file  = cstr dst.realdirpath.to_path
+    @file  = cstr dst.to_path
   end
 
   def render partial, opts = { :locals => {} }
diff --git a/tool/ruby_vm/helpers/scanner.rb b/tool/ruby_vm/helpers/scanner.rb
index 2ae5ad66b1..410b02eff5 100644
--- a/tool/ruby_vm/helpers/scanner.rb
+++ b/tool/ruby_vm/helpers/scanner.rb
@@ -20,10 +20,10 @@ class RubyVM::Scanner
   attr_reader :__LINE__
 
   def initialize path
-    src       = Pathname.new(__FILE__).realpath.dirname
+    src       = Pathname.new(__FILE__).relative_path_from(Pathname.pwd).dirname
     src      += path
     @__LINE__ = 1
-    @__FILE__ = src.realpath.to_path
+    @__FILE__ = src.to_path
     @str      = src.read mode: 'rt:utf-8:utf-8'
     @pos      = 0
   end
diff --git a/tool/ruby_vm/scripts/insns2vm.rb b/tool/ruby_vm/scripts/insns2vm.rb
index 4e474d9a52..564d91cd2d 100644
--- a/tool/ruby_vm/scripts/insns2vm.rb
+++ b/tool/ruby_vm/scripts/insns2vm.rb
@@ -15,7 +15,7 @@ require_relative '../controllers/application_controller.rb'
 
 module RubyVM::Insns2VM
   def self.router argv
-    options = { destdir: Dir.getwd }
+    options = { destdir: nil }
     targets = generate_parser(options).parse argv
     return targets.map do |i|
       next ApplicationController.new.generate i, options[:destdir]