diff --git a/ddp.md b/ddp.md
index 3240b3b3..895309ef 100644
--- a/ddp.md
+++ b/ddp.md
@@ -5,7 +5,7 @@ permalink: /ddp/
 ---
 
 - [Slidify to Github walkthrough](http://rpubs.com/thoughtfulbloke/25103)
-- [ggvis and rmarkdown slides with interactive plots](http://qua.st/ggvis-shiny-html5-slides/)
+- [ggvis and rmarkdown slides with interactive plots](http://qua.st/ggvis-shiny-html5-slides)
 
 ## Shiny
 - [Shiny app to simulate 401K growth with interactive plots](http://www.mephistosoftware.com/shiny/401k_simulator/)