diff --git a/lib/ace/mode/lsl_highlight_rules.js b/lib/ace/mode/lsl_highlight_rules.js
index d8ec8561..2cbb8697 100644
--- a/lib/ace/mode/lsl_highlight_rules.js
+++ b/lib/ace/mode/lsl_highlight_rules.js
@@ -193,7 +193,7 @@ function LSLHighlightRules() {
             "PERMISSION_CHANGE_PERMISSIONS|PERMISSION_RELEASE_OWNERSHIP|PERMISSION_REMAP_CONTROLS|" +
             "PRIM_CAST_SHADOWS|PRIM_TYPE_LEGACY|PSYS_SRC_INNERANGLE|PSYS_SRC_OUTERANGLE|" +
             "VEHICLE_FLAG_NO_FLY_UP",
-        "invalid.illegal.lsl" : "event",
+        "invalid.illegal.lsl" : "event|print",
         "keyword.control.lsl" : "do|else|for|if|jump|return|while",
         "storage.type.lsl" : "float|integer|key|list|quaternion|rotation|string|vector",
         "support.function.lsl": "llAbs|llAcos|llAddToLandBanList|llAddToLandPassList|" +