diff --git a/lib/ace/mode/clojure_highlight_rules.js b/lib/ace/mode/clojure_highlight_rules.js
index 6d69c035..f7e28d87 100644
--- a/lib/ace/mode/clojure_highlight_rules.js
+++ b/lib/ace/mode/clojure_highlight_rules.js
@@ -171,7 +171,7 @@ var ClojureHighlightRules = function() {
                 next: "string"
             }, {
                 token : "constant", // symbol
-                regex : /:[^()\[\]{}'"\^%`,;]+/
+                regex : /:[^()\[\]{}'"\^%`,;\s]+/
             }, {
                 token : "string.regexp", //Regular Expressions
                 regex : '/#"(?:\\.|(?:\\\")|[^\""\n])*"/g'