diff --git a/app/assets/javascripts/app/models/user.coffee b/app/assets/javascripts/app/models/user.coffee
index 0f950a917..69dfa12d4 100644
--- a/app/assets/javascripts/app/models/user.coffee
+++ b/app/assets/javascripts/app/models/user.coffee
@@ -90,8 +90,8 @@ class App.User extends App.Model
       height = 226 * size/baseSize
 
       rng = new Math.seedrandom(@id)
-      x   = rng * (width - size)
-      y   = rng * (height - size)
+      x   = rng() * (width - size)
+      y   = rng() * (height - size)
 
       return App.view('avatar_unique')
         data: data