diff --git a/spree_email_to_friend.gemspec b/spree_email_to_friend.gemspec
index d3fc61c..031cdfa 100644
--- a/spree_email_to_friend.gemspec
+++ b/spree_email_to_friend.gemspec
@@ -1,3 +1,4 @@
+# encoding: utf-8
 Gem::Specification.new do |s|
   s.platform    = Gem::Platform::RUBY
   s.name        = 'spree_email_to_friend'