diff --git a/nixos/modules/services/x11/desktop-managers/gnome3.nix b/nixos/modules/services/x11/desktop-managers/gnome3.nix
index 3c13e866eb1..b045edcc784 100644
--- a/nixos/modules/services/x11/desktop-managers/gnome3.nix
+++ b/nixos/modules/services/x11/desktop-managers/gnome3.nix
@@ -44,9 +44,10 @@ in {
     };
 
     environment.gnome3.packageSet = mkOption {
-      default = pkgs.gnome3;
+      default = null;
       example = literalExample "pkgs.gnome3_10";
       description = "Which Gnome 3 package set to use.";
+      apply = p: if p == null then pkgs.gnome3 else p;
     };
     
     environment.gnome3.excludePackages = mkOption {
diff --git a/nixos/modules/services/x11/display-managers/gdm.nix b/nixos/modules/services/x11/display-managers/gdm.nix
index 9d14fc2e137..080588df247 100644
--- a/nixos/modules/services/x11/display-managers/gdm.nix
+++ b/nixos/modules/services/x11/display-managers/gdm.nix
@@ -5,8 +5,8 @@ with lib;
 let
 
   cfg = config.services.xserver.displayManager;
-  gdm = pkgs.gnome3_12.gdm; # gdm 3.10 not supported
   gnome3 = config.environment.gnome3.packageSet;
+  gdm = gnome3.gdm;
 
 in