diff --git a/README.org b/README.org
index 2c2451b..5f4b3ab 100644
--- a/README.org
+++ b/README.org
@@ -125,7 +125,7 @@
 ** Acknowledgements
    Thanks to:
    - John Wiegley for fixing a bug with the face definitions under
-     Emacs 24 & for plugging macrostep in his [[http://www.youtube.com/watch?v%3DRvPFZL6NJNQ][EmacsConf presentation]]!
+     Emacs 24 & for plugging macrostep in his [[http://youtu.be/RvPFZL6NJNQ][EmacsConf presentation]]!
    - George Kettleborough for bug reports and patch to highlight the
      expanded region
 
diff --git a/macrostep.el b/macrostep.el
index e5273ee..8849451 100644
--- a/macrostep.el
+++ b/macrostep.el
@@ -164,7 +164,7 @@
 ;; - George Kettleborough for bug reports and patch to highlight the
 ;;   expanded region
 ;;
-;;   [EmacsConf presentation]: http://www.youtube.com/watch?v%3DRvPFZL6NJNQ
+;;   [EmacsConf presentation]: http://youtu.be/RvPFZL6NJNQ
 ;;
 ;; 1.6 Changelog 
 ;; ==============