diff --git a/doc/config-examples/closed-install-configuration.nix b/doc/config-examples/closed-install-configuration.nix
index fed557ddd0d..0cebacdb0cc 100644
--- a/doc/config-examples/closed-install-configuration.nix
+++ b/doc/config-examples/closed-install-configuration.nix
@@ -1,6 +1,6 @@
 {
   boot = {
-    grubDevice = "/dev/sda";
+    loader.grub.device = "/dev/sda";
     copyKernels = true;
     bootMount = "(hd0,0)";
   };
diff --git a/doc/config-examples/svn-server.nix b/doc/config-examples/svn-server.nix
index 68a3374987f..e727007117b 100644
--- a/doc/config-examples/svn-server.nix
+++ b/doc/config-examples/svn-server.nix
@@ -1,6 +1,6 @@
 {
   boot = {
-    grubDevice = "/dev/sda";
+    loader.grub.device = "/dev/sda";
   };
 
   fileSystems = [
diff --git a/doc/config-examples/x86_64-usbstick.nix b/doc/config-examples/x86_64-usbstick.nix
index b76a07b0d57..492b7a841a1 100644
--- a/doc/config-examples/x86_64-usbstick.nix
+++ b/doc/config-examples/x86_64-usbstick.nix
@@ -2,7 +2,7 @@
 
 {
   boot = {
-    grubDevice = "/dev/sda";
+    loader.grub.device = "/dev/sda";
     initrd = {
       kernelModules = ["usb_storage" "ehci_hcd" "ohci_hcd"];
       enableSplashScreen = false;
diff --git a/doc/manual/installation.xml b/doc/manual/installation.xml
index b040b4ff164..7761fc97245 100644
--- a/doc/manual/installation.xml
+++ b/doc/manual/installation.xml
@@ -118,7 +118,7 @@ $ nixos-option --install</screen>
 
     <para>You need to specify a root file system in
     <option>fileSystems</option> and the target device for the Grub boot
-    loader in <option>boot.grubDevice</option>.  See
+    loader in <option>boot.loader.grub.device</option>.  See
     <xref linkend="ch-options"/> for a list of the available configuration
     options.</para>
 
diff --git a/modules/system/activation/no-clone.nix b/modules/system/activation/no-clone.nix
index d28183d2dc4..f15809e4d8b 100644
--- a/modules/system/activation/no-clone.nix
+++ b/modules/system/activation/no-clone.nix
@@ -6,8 +6,6 @@ with pkgs.lib;
 
 {
   boot.loader.grub.device = mkOverrideTemplate 0 {} "nodev";
-  # undefined the obsolete name of the previous option.
-  boot.grubDevice = mkOverrideTemplate 0 {} pkgs.lib.mkNotdef;
   nesting.children = mkOverrideTemplate 0 {} [];
   nesting.clone = mkOverrideTemplate 0 {} [];
 }