diff --git a/modules/lang/nix/config.el b/modules/lang/nix/config.el
index b65f732ad..bda5cb76a 100644
--- a/modules/lang/nix/config.el
+++ b/modules/lang/nix/config.el
@@ -47,3 +47,7 @@
 
 (use-package! nix-repl
   :commands nix-repl-show)
+
+;; Tree sitter
+(eval-when! (featurep! +tree-sitter)
+  (add-hook! 'nix-mode-local-vars-hook #'tree-sitter!))
diff --git a/modules/lang/zig/config.el b/modules/lang/zig/config.el
index 09a8e5d7e..828a48129 100644
--- a/modules/lang/zig/config.el
+++ b/modules/lang/zig/config.el
@@ -30,3 +30,6 @@
         "f" #'zig-format-buffer
         "r" #'zig-run
         "t" #'zig-test-buffer))
+
+(eval-when! (featurep! +tree-sitter)
+  (add-hook! 'zig-mode-local-vars-hook #'tree-sitter!))