diff --git a/plugins/ruby/ruby.plugin.zsh b/plugins/ruby/ruby.plugin.zsh
index 38e4d7cd0..5532aa8e8 100644
--- a/plugins/ruby/ruby.plugin.zsh
+++ b/plugins/ruby/ruby.plugin.zsh
@@ -4,3 +4,9 @@ alias sgem='sudo gem'
 
 # Find ruby file
 alias rfind='find . -name "*.rb" | xargs grep -n'
+
+# Add first line "#encoding: UTF-8" into a file (for Ruby 1.9)
+encoding_file = function() {
+	sed '1i#encoding: UTF-8' $1 > /tmp/new_file.tmp
+	mv /tmp/new_file.tmp $1
+}