diff --git a/h/js/controllers.coffee b/h/js/controllers.coffee
index 11cbde217a3..23f066e7156 100644
--- a/h/js/controllers.coffee
+++ b/h/js/controllers.coffee
@@ -58,7 +58,7 @@ class App
 
       elem.selectAll('.heatmap-pointer')
         # Creates highlights corresponding bucket when mouse is hovered
-        .on 'mousemove', (bucket) =>
+        .on 'mouseover', (bucket) =>
           unless $location.path() == '/viewer' and $location.search()?.id?
             provider.notify
               method: 'setActiveHighlights'