diff --git a/modules/services/x11/desktop-managers/xfce.nix b/modules/services/x11/desktop-managers/xfce.nix
index 46b054989e02..4e8689f7ca71 100644
--- a/modules/services/x11/desktop-managers/xfce.nix
+++ b/modules/services/x11/desktop-managers/xfce.nix
@@ -33,7 +33,11 @@ in
             
             # Set GTK_DATA_PREFIX so that GTK+ can find the Xfce themes.
             export GTK_DATA_PREFIX=${config.system.path}
-            
+
+            # Necessary to get xfce4-mixer to find GST's ALSA plugin.
+            # Ugly.
+            export GST_PLUGIN_PATH=${config.system.path}/lib
+
             exec ${pkgs.stdenv.shell} ${pkgs.xfce.xfceutils}/etc/xdg/xfce4/xinitrc
           '';
       };
@@ -55,6 +59,7 @@ in
         pkgs.xfce.xfce4panel
         pkgs.xfce.xfce4session
         pkgs.xfce.xfce4settings
+        pkgs.xfce.xfce4mixer
         pkgs.xfce.xfceutils
         pkgs.xfce.xfconf
         pkgs.xfce.xfdesktop