diff --git a/modules/tools/direnv/config.el b/modules/tools/direnv/config.el
index 2ffd62137..31744deb6 100644
--- a/modules/tools/direnv/config.el
+++ b/modules/tools/direnv/config.el
@@ -13,5 +13,12 @@ buffer/window/frame switch, which is less expensive."
       (add-hook 'focus-in-hook #'direnv--maybe-update-environment)))
   (add-hook 'direnv-mode-hook #'+direnv|init)
 
+  (defun +direnv*update (&rest _)
+    "Update direnv. Useful to advise functions that may run
+environment-sensitive logic like `flycheck-default-executable-find'. This fixes
+flycheck issues with direnv and on nix."
+    (direnv-update-environment default-directory))
+  (advice-add #'flycheck-default-executable-find :before #'+direnv*update)
+
   (when (executable-find "direnv")
     (direnv-mode +1)))