diff --git a/tool/ruby_vm/helpers/dumper.rb b/tool/ruby_vm/helpers/dumper.rb
index 00c301c01c..98104f4b92 100644
--- a/tool/ruby_vm/helpers/dumper.rb
+++ b/tool/ruby_vm/helpers/dumper.rb
@@ -25,7 +25,8 @@ class RubyVM::Dumper
   end
 
   def new_erb spec
-    path  = Pathname.new(__FILE__).relative_path_from(Pathname.pwd).dirname
+    path  = Pathname.new(__FILE__)
+    path  = (path.relative_path_from(Pathname.pwd) rescue path).dirname
     path += '../views'
     path += spec
     src   = path.read mode: 'rt:utf-8:utf-8'
diff --git a/tool/ruby_vm/helpers/scanner.rb b/tool/ruby_vm/helpers/scanner.rb
index 593271a415..ef6de8120e 100644
--- a/tool/ruby_vm/helpers/scanner.rb
+++ b/tool/ruby_vm/helpers/scanner.rb
@@ -20,7 +20,8 @@ class RubyVM::Scanner
   attr_reader :__LINE__
 
   def initialize path
-    src       = Pathname.new(__FILE__).relative_path_from(Pathname.pwd).dirname
+    src       = Pathname.new(__FILE__)
+    src       = (src.relative_path_from(Pathname.pwd) rescue src).dirname
     src      += path
     @__LINE__ = 1
     @__FILE__ = src.to_path