diff --git a/lib/fog/aws/dns.rb b/lib/fog/aws/dns.rb
index 962d0eef8..3efac4c09 100644
--- a/lib/fog/aws/dns.rb
+++ b/lib/fog/aws/dns.rb
@@ -111,7 +111,7 @@ module Fog
         def signature(params)
           string_to_sign = params[:headers]['Date']
           signed_string = @hmac.sign(string_to_sign)
-          signature = Base64.encode64(signed_string).chomp!
+          Base64.encode64(signed_string).chomp!
         end
       end
     end