diff --git a/app/assets/javascripts/app/lib/app_post/utils.coffee b/app/assets/javascripts/app/lib/app_post/utils.coffee
index d113687a8..b11168bb4 100644
--- a/app/assets/javascripts/app/lib/app_post/utils.coffee
+++ b/app/assets/javascripts/app/lib/app_post/utils.coffee
@@ -594,7 +594,7 @@ class App.Utils
     num
 
   @icon: (name, className = '') ->
-    path = if svgPolyfill then '' else 'assets/images/icons.svg'
+    path = if window.svgPolyfill then '' else 'assets/images/icons.svg'
     "<svg class=\"icon icon-#{name} #{className}\"><use xlink:href=\"#{path}#icon-#{name}\" /></svg>"
 
   @getScrollBarWidth: ->
diff --git a/app/views/init/index.html.erb b/app/views/init/index.html.erb
index 69595b00a..6d69303b9 100644
--- a/app/views/init/index.html.erb
+++ b/app/views/init/index.html.erb
@@ -9,7 +9,7 @@
     - Edge 12
     - IE 9-11
   */
-  var svgPolyfill = /\bEdge\/12\b|\bTrident\/[567]\b|\bVersion\/7.0 Safari\b/.test(navigator.userAgent) || (navigator.userAgent.match(/AppleWebKit\/(\d+)/) || [])[1] < 537;
+  window.svgPolyfill = /\bEdge\/12\b|\bTrident\/[567]\b|\bVersion\/7.0 Safari\b/.test(navigator.userAgent) || (navigator.userAgent.match(/AppleWebKit\/(\d+)/) || [])[1] < 537;
 
   (function (doc) {
     if(!svgPolyfill)