diff --git a/editor-extensions/vscode/syntaxes/grain.json b/editor-extensions/vscode/syntaxes/grain.json
index 59aac1e..08a3856 100644
--- a/editor-extensions/vscode/syntaxes/grain.json
+++ b/editor-extensions/vscode/syntaxes/grain.json
@@ -625,7 +625,7 @@
     "identifier": {
       "patterns": [
         {
-          "match": "(\\bis\\b|=|(\\+|-|\\*|\\/)=|\\+|-|\\*|\\/|%|<=|>=|<|>|==|!=|:=|\\!|&&|&|\\|\\||\\||\\^|\\.\\.\\.|\\.)",
+          "match": "(\\bis(nt)?\\b|=|(\\+|-|\\*|\\/)=|\\+|-|\\*|\\/|%|<=|>=|<|>|==|!=|:=|\\!|&&|&|\\|\\||\\||\\^|\\.\\.\\.|\\.)",
           "captures": {
             "1": { "name": "keyword.operator.grain" }
           }