diff --git a/modules/services/x11/desktop-managers/kde4.nix b/modules/services/x11/desktop-managers/kde4.nix
index 6e0d5057126..dcc3859820c 100644
--- a/modules/services/x11/desktop-managers/kde4.nix
+++ b/modules/services/x11/desktop-managers/kde4.nix
@@ -42,6 +42,8 @@ let
 
   phononBackendPackages = flip concatMap cfg.phononBackends
     (name: attrByPath [name] (throw "unknown phonon backend `${name}'") phononBackends);
+
+  wantsUdisks2 = pkgs.kde4.kdelibs.wantsUdisks2 or false;
 in
 
 {
@@ -155,7 +157,8 @@ in
       };
 
     # Enable helpful DBus services.
-    services.udisks.enable = true;
+    services.udisks.enable = ! wantsUdisks2;
+    services.udisks2.enable = wantsUdisks2;
     services.upower.enable = config.powerManagement.enable;
 
     security.pam.services = [ { name = "kde"; allowNullPassword = true; startSession = true; } ];