diff --git a/docs/_templates/sidebarintro.html b/docs/_templates/sidebarintro.html
index 08ebba0..036d0cb 100644
--- a/docs/_templates/sidebarintro.html
+++ b/docs/_templates/sidebarintro.html
@@ -23,7 +23,7 @@
 
 <h3>Sponsor</h3>
 <a href="http://www.datacamp.com/?utm_source=python_guide&utm_campaign=display">
-<img src="http://media.kennethreitz.com.s3.amazonaws.com/ad.png" alt="">
+<img src="//media.kennethreitz.com.s3.amazonaws.com/ad.png" alt="">
 </a>
 
 <h3>O'Reilly Book</h3>
diff --git a/docs/_templates/sidebarlogo.html b/docs/_templates/sidebarlogo.html
index 688c9f9..9e91c1c 100644
--- a/docs/_templates/sidebarlogo.html
+++ b/docs/_templates/sidebarlogo.html
@@ -21,7 +21,7 @@
 
 <h3>Sponsor</h3>
 <a href="http://www.datacamp.com/?utm_source=python_guide&utm_campaign=display">
-<img src="http://media.kennethreitz.com.s3.amazonaws.com/ad.png" alt="">
+<img src="//media.kennethreitz.com.s3.amazonaws.com/ad.png" alt="">
 </a>
 
 <h3>O'Reilly Book</h3>