diff --git a/runtime/themes/sonokai.toml b/runtime/themes/sonokai.toml
index ebe1ae8d2..2097e91e9 100644
--- a/runtime/themes/sonokai.toml
+++ b/runtime/themes/sonokai.toml
@@ -7,6 +7,7 @@
 
 "type" = "blue"
 "constant" = "fg"
+"constant.builtin" = "purple"
 "constant.numeric" = "purple"
 "constant.character.escape" = "orange"
 "string" = "yellow"