diff --git a/lib/ace/mode/sh_highlight_rules.js b/lib/ace/mode/sh_highlight_rules.js
index ec82c74f..bd0b4681 100644
--- a/lib/ace/mode/sh_highlight_rules.js
+++ b/lib/ace/mode/sh_highlight_rules.js
@@ -73,6 +73,8 @@ var ShHighlightRules = function() {
 
     var builtinVariable = "(?:\\$(?:SHLVL|\\$|\\!|\\?))";
 
+    var func = "(?:" + variableName + "\\s*\\(\\))";
+
     this.$rules = {
         "start" : [ {
             token : "comment",
@@ -86,6 +88,9 @@ var ShHighlightRules = function() {
         }, {
             token : "variable",
             regex : variable
+        }, {
+            token : "support.function",
+            regex : func,
         }, {
             token : "support.function",
             regex : fileDescriptor