diff --git a/queries/dart/highlights.scm b/queries/dart/highlights.scm
index 433379a65..12ef27d1a 100644
--- a/queries/dart/highlights.scm
+++ b/queries/dart/highlights.scm
@@ -155,6 +155,8 @@
 [
     ; "assert"
     (case_builtin)
+    "extension"
+    "on"
     "class"
     "enum"
     "extends"