diff --git a/.emacs.d/lisp/init-sly.el b/.emacs.d/lisp/init-sly.el
index 043f6a12..77a994a7 100644
--- a/.emacs.d/lisp/init-sly.el
+++ b/.emacs.d/lisp/init-sly.el
@@ -65,7 +65,12 @@ GUIX-COMMAND is the command to the guix executable, e.g. '(\"~/projects/guix/pre
                      (when no-grafts?
                        (list "--no-grafts")))))
           (message "Running %S" (mapconcat #'identity (cons command args) " "))
-          (apply #'call-process command nil nil nil args))
+          (let* ((output (get-buffer-create " *Guix SBCL for Nyxt*"))
+                 (status (apply #'call-process command nil `(,output t) nil args)))
+            (if (= status 0)
+                (kill-buffer output)
+              (switch-to-buffer-other-window output)
+              (error "Guix command failed, see %s" output))))
         ;; Update root mtime in case it's not changed.
         ;; Can't use `set-file-times' on links.
         (call-process "touch" nil nil nil "-h" root))