diff --git a/manual/templates/layout.html b/manual/templates/layout.html
index 52a03a6691..afd9728a6d 100644
--- a/manual/templates/layout.html
+++ b/manual/templates/layout.html
@@ -61,7 +61,7 @@
         <form action="https://www.paypal.com/cgi-bin/webscr" method="post" title="Contribute to support calibre development">
             <input type="hidden" name="cmd" value="_s-xclick" />
             <input type="hidden" name="hosted_button_id" value="AF4H3B8QVDG6N" />
-            <input type="image" src="_static/simple_donate_button.gif" border="0" name="submit" alt="Contribute to support calibre development" style="border:0pt" />
+            <input type="image" src="{{ pathto('_static/simple_donate_button.gif', 1) }}" border="0" name="submit" alt="Contribute to support calibre development" style="border:0pt" />
             <img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1" />
         </form>
         <hr/>