diff --git a/apheleia-formatters.el b/apheleia-formatters.el
index 26c0a07..e1ce8c1 100644
--- a/apheleia-formatters.el
+++ b/apheleia-formatters.el
@@ -318,6 +318,7 @@ rather than using this system."
     (json-mode . prettier-json)
     (json-ts-mode . prettier-json)
     (kotlin-mode . ktlint)
+    (kotlin-ts-mode . ktlint)
     (latex-mode . latexindent)
     (LaTeX-mode . latexindent)
     (lua-mode . stylua)