diff --git a/flake.nix b/flake.nix
index 702541b..50c11a6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -199,6 +199,9 @@
                   finder.ShowPathbar = true;
                   finder.ShowStatusBar = true;
 
+                  # Disable guest logins
+                  loginwindow.GuestEnabled = false;
+
                   # Disable quarantine for downloaded files
                   LaunchServices.LSQuarantine = false;