diff --git a/queries/highlights.scm b/queries/highlights.scm
index b4cc660..7422e6f 100644
--- a/queries/highlights.scm
+++ b/queries/highlights.scm
@@ -49,6 +49,14 @@
     field: (identifier) @variable.member))
 ; }}}
 
+; Built-ins {{{
+[
+ (unset)
+ "default"
+] @variable.builtin
+(selection_type) @function.builtin
+; }}}
+
 ; Expressions {{{
 (map_expression
   (property
diff --git a/test/highlight/builtins.bp b/test/highlight/builtins.bp
new file mode 100644
index 0000000..508a8ed
--- /dev/null
+++ b/test/highlight/builtins.bp
@@ -0,0 +1,14 @@
+foo = select(soong_config_variable("my_namespace", "my_var"), {
+    //       ^ function.builtin
+    "foo": unset,
+    //     ^ variable.builtin
+    default: select(variant("VARIANT") {}),
+    // <- variable.builtin
+    //              ^ function.builtin
+})
+
+/* Assigning to builtins is conveniently not allowed at runtime */
+unset = 12
+// <- variable.builtin
+default = 27
+// <- variable.builtin