diff --git a/lisp/doom-packages.el b/lisp/doom-packages.el
index 5a6cb7e4e..6b199232e 100644
--- a/lisp/doom-packages.el
+++ b/lisp/doom-packages.el
@@ -111,7 +111,10 @@ uses a straight or package.el command directly).")
   ;;   changed afterwards.
   (setq straight--native-comp-available nil)
   ;; `let-alist' is built into Emacs 26 and onwards
-  (add-to-list 'straight-built-in-pseudo-packages 'let-alist))
+  (add-to-list 'straight-built-in-pseudo-packages 'let-alist)
+  ;; `seq' is built into all Emacs versions Doom supports, so avoid installing
+  ;; newer (and possibly incompatible) versions of seq.
+  (add-to-list 'straight-built-in-pseudo-packages 'seq))
 
 (defadvice! doom--read-pinned-packages-a (fn &rest args)
   "Read `:pin's in `doom-packages' on top of straight's lockfiles."