diff --git a/doc-jp/README.SSL b/doc-jp/README.SSL
index 670ed5f..47d5fd6 100644
--- a/doc-jp/README.SSL
+++ b/doc-jp/README.SSL
@@ -85,6 +85,9 @@ SSL 
 #
 # certdata2pem.rb
 
+if RUBY_VERSION>="1.9"
+  Encoding.default_external="UTF-8"
+end
 while line = $stdin.gets
   next if line =~ /^#/
   next if line =~ /^\s*$/