diff --git a/configuration.nix b/configuration.nix
index a671f5c..03c5c2a 100755
--- a/configuration.nix
+++ b/configuration.nix
@@ -46,6 +46,9 @@
   # Enable firmware updates.
   services.fwupd.enable = true;
 
+  # Enable smart card support (for YubiKey).
+  services.pcscd.enable = true;
+
   # Define hostname.
   networking.hostName = "muskduck";