check Encoding.default_external, not IO#external_encoding

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/asciidoctor.rb b/lib/asciidoctor.rb
index 787f4164..e0f3bfca 100755
--- a/lib/asciidoctor.rb
+++ b/lib/asciidoctor.rb
@@ -97,7 +97,7 @@ module Asciidoctor
   # _All_ input data must be force encoded to UTF-8 if Encoding.default_external is *not* UTF-8
   # Address failures performing string operations that are reported as "invalid byte sequence in US-ASCII" 
   # Ruby 1.8 doesn't seem to experience this problem (perhaps because it isn't validating the encodings)
-  FORCE_ENCODING = RUBY_VERSION > '1.9' && File.new(__FILE__).external_encoding != Encoding::UTF_8
+  FORCE_ENCODING = RUBY_VERSION > '1.9' && Encoding.default_external != Encoding::UTF_8
 
   # The default document type
   # Can influence markup generated by render templates