diff --git a/pkg/dm-crypt/build.yml b/pkg/dm-crypt/build.yml
index a255f0c84..2553e55e9 100644
--- a/pkg/dm-crypt/build.yml
+++ b/pkg/dm-crypt/build.yml
@@ -3,6 +3,10 @@ config:
   binds:
     - /dev:/dev
     - /etc/dm-crypt:/etc/dm-crypt
+  devices:
+    # all devices (/dev/mapper is a character device)
+    - path: all
+      type: a
   capabilities:
     - CAP_SYS_ADMIN
     - CAP_MKNOD