diff --git a/lib/ace/mode/python_highlight_rules.js b/lib/ace/mode/python_highlight_rules.js
index 2e8f9044ed6..393f8187d10 100644
--- a/lib/ace/mode/python_highlight_rules.js
+++ b/lib/ace/mode/python_highlight_rules.js
@@ -171,7 +171,7 @@ var PythonHighlightRules = function() {
             regex: "[\\]\\)\\}]"
         }, {
             token: ["keyword", "text", "entity.name.function"],
-            regex: "(def|class)(\\s+)(\\w+)"
+            regex: "(def|class)(\\s+)([\\u00BF-\\u1FFF\\u2C00-\\uD7FF\\w]+)"
          }, {
             token: "text",
             regex: "\\s+"