diff --git a/src/darkslide/themes/default/js/slides.js b/src/darkslide/themes/default/js/slides.js
index 9e357957..253f98e8 100644
--- a/src/darkslide/themes/default/js/slides.js
+++ b/src/darkslide/themes/default/js/slides.js
@@ -164,7 +164,7 @@ function main() {
         }
 
         var w = isPresenterView ? window.opener : presenterViewWin;
-        if (w) w.postMessage('slide#' + currentSlideNo, '*');
+        if (w) w.postMessage('slide#' + currentSlideNo);
     };
 
     var nextSlide = function () {