diff --git a/gnu/installer.scm b/gnu/installer.scm
index 6c11fa619828af59a88e14eed8c494b5b9a17ca7..50f5b1aa776eb6d34e305cf0e254f4efa5c72114 100644
--- a/gnu/installer.scm
+++ b/gnu/installer.scm
@@ -61,6 +61,14 @@ (define module-to-import?
     (('guix 'build _ ...) #t)
     (_ #f)))
 
+(define not-config?
+  ;; Select (guix …) and (gnu …) modules, except (guix config).
+  (match-lambda
+    (('guix 'config) #f)
+    (('guix _ ...) #t)
+    (('gnu _ ...) #t)
+    (_ #f)))
+
 (define* (build-compiled-file name locale-builder)
   "Return a file-like object that evalutes the gexp LOCALE-BUILDER and store
 its result in the scheme file NAME. The derivation will also build a compiled
@@ -75,8 +83,10 @@ (define set-utf8-locale
 
   (define builder
     (with-extensions (list guile-json-3)
-      (with-imported-modules (source-module-closure
-                              '((gnu installer locale)))
+      (with-imported-modules `(,@(source-module-closure
+                                  '((gnu installer locale))
+                                  #:select? not-config?)
+                               ((guix config) => ,(make-config.scm)))
         #~(begin
             (use-modules (gnu installer locale))