diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index 28e6cb1f5f..190b717163 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -240,7 +240,11 @@ the 'share/X11/xkb/symbols/' directory of 'xkeyboard-config'."
                   "-i" #+(keyboard-layout->console-keymap layout)
                   "-o" #$output))))
 
-  (computed-file (string-append "grub-keymap." (keyboard-layout-name layout))
+  (computed-file (string-append "grub-keymap."
+                                (string-map (match-lambda
+                                              (#\, #\-)
+                                              (chr chr))
+                                            (keyboard-layout-name layout)))
                  builder))
 
 (define (grub-setup-io config)
diff --git a/gnu/system/keyboard.scm b/gnu/system/keyboard.scm
index cd3ab37b27..5bd13a44be 100644
--- a/gnu/system/keyboard.scm
+++ b/gnu/system/keyboard.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -94,5 +94,8 @@ Layout information is taken from the XKEYBOARD-CONFIG package."
                    #$(keyboard-layout-name layout))))))
 
   (computed-file (string-append "console-keymap."
-                                (keyboard-layout-name layout))
+                                (string-map (match-lambda
+                                              (#\, #\-)
+                                              (chr chr))
+                                            (keyboard-layout-name layout)))
                  build))