diff --git a/hosts/idols-ruby/default.nix b/hosts/idols-ruby/default.nix
index d3644159..83dbc656 100644
--- a/hosts/idols-ruby/default.nix
+++ b/hosts/idols-ruby/default.nix
@@ -14,6 +14,8 @@ let
 in {
   imports = mylib.scanPaths ./.;
 
+  # Enable binfmt emulation of aarch64-linux, this is required for cross compilation.
+  boot.binfmt.emulatedSystems = ["aarch64-linux" "riscv64-linux"];
   # supported file systems, so we can mount any removable disks with these filesystems
   boot.supportedFilesystems = [
     "ext4"