diff --git a/URL-signing.md b/URL-signing.md
index 6edd0ff..eb73f91 100644
--- a/URL-signing.md
+++ b/URL-signing.md
@@ -67,7 +67,7 @@ RYifAJRfbhsitJeOrDNxWURCCkPsVR4ihCPXNv-ePbA
 
 ```ruby
 require 'openssl'
-require 'Base64'
+require 'base64'
 
 key = "test"
 data = "https://www.google.fr/images/srpr/logo11w.png"