diff --git a/4chan_x.user.js b/4chan_x.user.js
index 06183f69c..d5f04a199 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -1841,7 +1841,7 @@
         });
         ta.style.cssText = $.get('QR.size', '');
       }
-      mimeTypes = $('.rules').firstElementChild.textContent.match(/: (.+)/)[1].toLowerCase().replace(/\w+/g, function(type) {
+      mimeTypes = $('.rules').firstElementChild.textContent.trim().match(/: (.+)/)[1].toLowerCase().replace(/\w+/g, function(type) {
         switch (type) {
           case 'jpg':
             return 'image/jpeg';
diff --git a/script.coffee b/script.coffee
index 022c8f4ef..8be25ce58 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1405,7 +1405,7 @@ QR =
       ta.style.cssText = $.get 'QR.size', ''
 
     # Allow only this board's supported files.
-    mimeTypes = $('.rules').firstElementChild.textContent.match(/: (.+)/)[1].toLowerCase().replace /\w+/g, (type) ->
+    mimeTypes = $('.rules').firstElementChild.textContent.trim().match(/: (.+)/)[1].toLowerCase().replace /\w+/g, (type) ->
       switch type
         when 'jpg'
           'image/jpeg'