diff --git a/app/assets/javascripts/discourse/lib/emoji/emoji.js.erb b/app/assets/javascripts/discourse/lib/emoji/emoji.js.erb
index 92a1071f371..4643cf34fa6 100644
--- a/app/assets/javascripts/discourse/lib/emoji/emoji.js.erb
+++ b/app/assets/javascripts/discourse/lib/emoji/emoji.js.erb
@@ -8,10 +8,12 @@ var emoji = <%= Emoji.standard.map(&:name).flatten.inspect %>;
 var aliases = <%= Emoji.aliases.inspect.gsub("=>", ":") %>;
 
 var extendedEmoji = {};
-Discourse.Dialect.registerEmoji = function(code, url) {
-  code = code.toLowerCase();
-  extendedEmoji[code] = url;
-};
+if (Discourse.Dialect) {
+  Discourse.Dialect.registerEmoji = function(code, url) {
+    code = code.toLowerCase();
+    extendedEmoji[code] = url;
+  };
+}
 
 var _unicodeReplacements;
 var _unicodeRegexp;