diff --git a/lib/ace/mode/php_highlight_rules.js b/lib/ace/mode/php_highlight_rules.js
index 274acb00..0f45e374 100644
--- a/lib/ace/mode/php_highlight_rules.js
+++ b/lib/ace/mode/php_highlight_rules.js
@@ -449,7 +449,7 @@ var PhpHighlightRules = function() {
     );
 
     var builtinVariables = lang.arrayToMap(
-        ('$_GLOBALS|$_SERVER|$_GET|$_POST|$_FILES|$_REQUEST|$_SESSION|$_ENV|$_COOKIE|$php_errormsg|$HTTP_RAW_POST_DATA|' +
+        ('$GLOBALS|$_SERVER|$_GET|$_POST|$_FILES|$_REQUEST|$_SESSION|$_ENV|$_COOKIE|$php_errormsg|$HTTP_RAW_POST_DATA|' +
         '$http_response_header|$argc|$argv').split('|')
     );