diff --git a/URL-signing.md b/URL-signing.md
index 7908a45..86ae025 100644
--- a/URL-signing.md
+++ b/URL-signing.md
@@ -88,5 +88,5 @@ import base64
 
 key = 'secret key'
 data = 'https://octodex.github.com/images/codercat.jpg'
-print base64.b64encode(hmac.new(key, msg=data, digestmod=hashlib.sha256).digest()) 
+print base64.urlsafe_b64encode(hmac.new(key, msg=data, digestmod=hashlib.sha256).digest()) 
 ```
\ No newline at end of file