diff --git a/.emacs.d/init.el b/.emacs.d/init.el
index b0d27d7..e9ce562 100644
--- a/.emacs.d/init.el
+++ b/.emacs.d/init.el
@@ -1018,7 +1018,7 @@
   :init
   (defun prettier-js-mode-maybe ()
     (interactive)
-    (when (not (call-process "prettier" nil nil nil "--find-config-path" (buffer-file-name)))
+    (when (= 0 (call-process "prettier" nil nil nil "--find-config-path" (buffer-file-name)))
       (prettier-js-mode t))))
 
 (use-package show-marks