diff --git a/app/assets/javascripts/app.js b/app/assets/javascripts/app.js
index c05b891..6670485 100644
--- a/app/assets/javascripts/app.js
+++ b/app/assets/javascripts/app.js
@@ -46,7 +46,7 @@ $(function(){
     format: function(time, unit) {
       time = Math.abs(time);
       if (!unit) return "just now";
-      if (time === 1) time = "a";
+      if (time === 1) time = (unit[0] == "h") ? "an" : "a";
       var tail = time < 0 ? " ahead" : " ago";
       return time + " " + unit + tail;
     }