diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 3a4d8e789c..6539bfd6ce 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1768,12 +1768,12 @@ (define (guix-machines-files-installation machines)
 
         ;; Installed the declared machines file.
         (symlink #+(scheme-file "machines.scm"
-                                #~((@ (srfi srfi-1) concatenate)
-                                   (map (lambda (entry)
-                                          (if (build-machine? entry)
-                                            (list entry)
-                                            entry))
-                                        #$machines)))
+                                #~((@ (srfi srfi-1) append-map)
+                                   (lambda (entry)
+                                     (if (build-machine? entry)
+                                         (list entry)
+                                         entry))
+                                   #$machines))
                  machines-file))))
 
 (define-record-type* <guix-configuration>