diff --git a/gnu/system/install.scm b/gnu/system/install.scm
index 3ab5c47cda..ad234fd9c1 100644
--- a/gnu/system/install.scm
+++ b/gnu/system/install.scm
@@ -255,8 +255,8 @@ (define %nscd-minimal-caches
                     (persistent? #f)
                     (max-database-size (* 5 (expt 2 20)))))) ;5 MiB
 
-(define (installation-services)
-  "Return the list services for the installation image."
+(define %installation-services
+  ;; List of services of the installation system.
   (let ((motd (plain-file "motd" "
 Welcome to the installation of the Guix System Distribution!
 
@@ -377,8 +377,7 @@ (define installation-os
                   (home-directory "/home/guest"))))
 
     (issue %issue)
-
-    (services (installation-services))
+    (services %installation-services)
 
     ;; We don't need setuid programs so pass the empty list so we don't pull
     ;; additional programs here.