diff --git a/doc/refcard/guix-refcard.lout b/doc/refcard/guix-refcard.lout
index 8cc811e..f0c65f4 100644
--- a/doc/refcard/guix-refcard.lout
+++ b/doc/refcard/guix-refcard.lout
@@ -295,7 +295,7 @@ complete } configuration of an operating system, along these lines:
 
   (bootloader (bootloader-configuration
                 (bootloader grub-efi-bootloader)
-                (target "/boot/efi")
+                (target (list "/boot/efi"))
                 (keyboard-layout keyboard-layout)))
   (file-systems (cons (file-system
                         (device (file-system-label "my-root"))