diff --git a/modules/services/x11/desktop-managers/kde4.nix b/modules/services/x11/desktop-managers/kde4.nix
index cce5ef54df13..1bea3592c262 100644
--- a/modules/services/x11/desktop-managers/kde4.nix
+++ b/modules/services/x11/desktop-managers/kde4.nix
@@ -152,6 +152,8 @@ in
     services.udisks = mkIf isKDE47 { enable = true; };
     services.upower = mkIf (isKDE47 && config.powerManagement.enable) { enable = true; };
 
+    security.pam.services = [ { name = "kde"; } ];
+
   };
 
 }