diff --git a/gnu/packages/admin.scm b/gnu/packages/admin.scm
index 531686fdbb..5c7e41f51b 100644
--- a/gnu/packages/admin.scm
+++ b/gnu/packages/admin.scm
@@ -74,6 +74,7 @@
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
   #:use-module (guix utils)
+  #:use-module (guix gexp)
   #:use-module (gnu packages)
   #:use-module (gnu packages algebra)
   #:use-module (gnu packages autogen)
@@ -936,25 +937,25 @@ to allow automatic login and starting any app.")
     (build-system trivial-build-system)
     (arguments
      `(#:modules ((guix build utils))
-       #:builder (begin
-                   (use-modules (guix build utils)
-                                (srfi srfi-26))
-
-                   (let* ((source (assoc-ref %build-inputs "source"))
-                          (tar    (assoc-ref %build-inputs "tar"))
-                          (xz     (assoc-ref %build-inputs "xz"))
-                          (output (assoc-ref %outputs "out"))
-                          (etc    (string-append output "/etc")))
-                     (setenv "PATH" (string-append xz "/bin"))
-                     (invoke (string-append tar "/bin/tar") "xvf"
-                             source)
-                     (chdir ,(string-append "netbase-" version))
-                     (mkdir-p etc)
-                     (for-each copy-file
-                               '("etc-services" "etc-protocols" "etc-rpc")
-                               (map (cut string-append etc "/" <>)
-                                    '("services" "protocols" "rpc")))
-                     #t))))
+       #:builder ,#~(begin
+                      (use-modules (guix build utils)
+                                   (srfi srfi-26))
+
+                      (let* ((source (assoc-ref %build-inputs "source"))
+                             (tar    (assoc-ref %build-inputs "tar"))
+                             (xz     (assoc-ref %build-inputs "xz"))
+                             (output (assoc-ref %outputs "out"))
+                             (etc    (string-append output "/etc")))
+                        (setenv "PATH" (string-append xz "/bin"))
+                        (invoke (string-append tar "/bin/tar") "xvf"
+                                source)
+                        (chdir #$(string-append "netbase-" version))
+                        (mkdir-p etc)
+                        (for-each copy-file
+                                  '("etc-services" "etc-protocols" "etc-rpc")
+                                  (map (cut string-append etc "/" <>)
+                                       '("services" "protocols" "rpc")))
+                        #t))))
     (native-inputs `(("tar" ,tar)
                      ("xz" ,xz)))
     (synopsis "IANA protocol, port, and RPC number assignments")