diff --git a/nixos/modules/system/boot/loader/grub/grub.nix b/nixos/modules/system/boot/loader/grub/grub.nix
index 0b6333ab573b..e7494161cb38 100644
--- a/nixos/modules/system/boot/loader/grub/grub.nix
+++ b/nixos/modules/system/boot/loader/grub/grub.nix
@@ -36,6 +36,7 @@ let
       grubEfi = f grubEfi;
       grubTargetEfi = if cfg.efiSupport && (cfg.version == 2) then f (grubEfi.grubTarget or "") else "";
       bootPath = args.path;
+      storePath = config.boot.loader.grub.storePath;
       efiSysMountPoint = if args.efiSysMountPoint == null then args.path else args.efiSysMountPoint;
       inherit (args) devices;
       inherit (efi) canTouchEfiVariables;
@@ -163,6 +164,15 @@ in
         '';
       };
 
+      storePath = mkOption {
+        default = "/nix/store";
+        type = types.str;
+        description = ''
+          Path to the Nix store when looking for kernels at boot.
+          Only makes sense when copyKernels is false.
+        '';
+      };
+
       extraPrepareConfig = mkOption {
         default = "";
         type = types.lines;
diff --git a/nixos/modules/system/boot/loader/grub/install-grub.pl b/nixos/modules/system/boot/loader/grub/install-grub.pl
index fcf5871203d5..9db6249c450a 100644
--- a/nixos/modules/system/boot/loader/grub/install-grub.pl
+++ b/nixos/modules/system/boot/loader/grub/install-grub.pl
@@ -55,6 +55,7 @@ my $fsIdentifier = get("fsIdentifier");
 my $grubEfi = get("grubEfi");
 my $grubTargetEfi = get("grubTargetEfi");
 my $bootPath = get("bootPath");
+my $storePath = get("storePath");
 my $canTouchEfiVariables = get("canTouchEfiVariables");
 my $efiSysMountPoint = get("efiSysMountPoint");
 $ENV{'PATH'} = get("path");
@@ -210,7 +211,7 @@ sub GrubFs {
 my $grubBoot = GrubFs($bootPath);
 my $grubStore;
 if ($copyKernels == 0) {
-    $grubStore = GrubFs("/nix/store");
+    $grubStore = GrubFs($storePath);
 }
 
 # Generate the header.