diff --git a/gnu/installer.scm b/gnu/installer.scm
index 53af01261e..5cd99e4013 100644
--- a/gnu/installer.scm
+++ b/gnu/installer.scm
@@ -146,10 +146,14 @@ (define (compiled-file-loader file name)
 
   (let* ((supported-locales #~(supported-locales->locales
                                #+(glibc-supported-locales)))
-         (iso-codes #~(string-append #$iso-codes/pinned "/share/iso-codes/json/"))
-         (iso639-3 #~(string-append #$iso-codes/pinned "iso_639-3.json"))
-         (iso639-5 #~(string-append #$iso-codes/pinned "iso_639-5.json"))
-         (iso3166 #~(string-append #$iso-codes/pinned "iso_3166-1.json"))
+
+         ;; Note: Use the latest version of 'iso-codes', including
+         ;; Guix-specific changes, so that all languages known to glibc and
+         ;; returned by 'glibc-supported-locales'.
+         (iso-codes #~(string-append #$iso-codes "/share/iso-codes/json/"))
+         (iso639-3 #~(string-append #$iso-codes "iso_639-3.json"))
+         (iso639-5 #~(string-append #$iso-codes "iso_639-5.json"))
+         (iso3166 #~(string-append #$iso-codes "iso_3166-1.json"))
          (locales-file (build-compiled-file
                         locales-name
                         #~`(quote ,#$supported-locales)))
@@ -437,9 +441,9 @@ (define installer-builder
             ;; (e.g., "French" is always displayed as "français", but
             ;; "Belgium" could be translated to Dutch, French, or German.)
             (bindtextdomain "iso_639-3"           ;languages
-                            #+(file-append iso-codes/pinned "/share/locale"))
+                            #+(file-append iso-codes "/share/locale"))
             (bindtextdomain "iso_3166-1"          ;territories
-                            #+(file-append iso-codes/pinned "/share/locale"))
+                            #+(file-append iso-codes "/share/locale"))
 
             ;; Likewise for XKB keyboard layout names.
             (bindtextdomain "xkeyboard-config"