diff --git a/gnu/build/linux-boot.scm b/gnu/build/linux-boot.scm
index 3bf3268..e755df9 100644
--- a/gnu/build/linux-boot.scm
+++ b/gnu/build/linux-boot.scm
@@ -170,6 +170,11 @@ with the given MAJOR number, starting with MINOR."
   (mknod (scope "dev/log") 'socket #o666 0)
   (mknod (scope "dev/kmsg") 'char-special #o600 (device-number 1 11))
 
+  ;; Device mapper control node, used by 'cryptsetup' et al.
+  (mkdir-p (scope "dev/mapper"))
+  (mknod (scope "dev/mapper/control") 'char-special #o600
+         (device-number 10 236))
+
   ;; Other useful nodes, notably relied on by guix-daemon.
   (for-each (match-lambda
              ((file major minor)