diff --git a/nixos/common/optional/yubikey.nix b/nixos/common/optional/yubikey.nix
index 9078daf..93db82f 100644
--- a/nixos/common/optional/yubikey.nix
+++ b/nixos/common/optional/yubikey.nix
@@ -13,6 +13,7 @@
   # Manage secret (private) keys.
   programs.gnupg.agent = {
     enable = true;
+    enableSSHSupport = true;
     pinentryPackage = pkgs.pinentry-gtk2;
   };