diff --git a/core/prelude-packages.el b/core/prelude-packages.el
index b6099b2..a31ec4d 100644
--- a/core/prelude-packages.el
+++ b/core/prelude-packages.el
@@ -143,6 +143,7 @@ PACKAGE is installed only if not already present.  The file is opened in MODE."
     ("\\.groovy\\'" groovy-mode groovy-mode)
     ("\\.haml\\'" haml-mode haml-mode)
     ("\\.hs\\'" haskell-mode haskell-mode)
+    ("\\.json\\'" json-mode json-mode)
     ("\\.kv\\'" kivy-mode kivy-mode)
     ("\\.latex\\'" auctex LaTeX-mode)
     ("\\.less\\'" less-css-mode less-css-mode)