diff --git a/queries/cpp/highlights.scm b/queries/cpp/highlights.scm
index 05f8d1846..4987d5924 100644
--- a/queries/cpp/highlights.scm
+++ b/queries/cpp/highlights.scm
@@ -86,6 +86,7 @@
 
 [
  "class"
+ "decltype"
  "constexpr"
  "delete"
  "explicit"