diff --git a/4chan_x.user.js b/4chan_x.user.js
index 7762539df..2d377cac8 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -1311,7 +1311,7 @@
         }
         threads = "<select>" + threads + "</select>";
       }
-      mimeTypes = $('.rules').textContent.toLowerCase().match(/: (.+)/)[1].replace(/\w+/g, function(type) {
+      mimeTypes = $('.rules').textContent.toLowerCase().match(/: (.+) /)[1].replace(/\w+/g, function(type) {
         switch (type) {
           case 'jpg':
             return 'image/jpeg';
diff --git a/script.coffee b/script.coffee
index c1736cbe2..06b08bf91 100644
--- a/script.coffee
+++ b/script.coffee
@@ -967,7 +967,7 @@ qr =
         threads += "<option value=#{thread.id}>Thread #{thread.id}</option>"
       threads = "<select>#{threads}</select>"
     # chose only supported files
-    mimeTypes = $('.rules').textContent.toLowerCase().match(/: (.+)/)[1].replace /\w+/g, (type) ->
+    mimeTypes = $('.rules').textContent.toLowerCase().match(/: (.+) /)[1].replace /\w+/g, (type) ->
       switch type
         when 'jpg'
           'image/jpeg'