diff --git a/nixos/modules/system/boot/loader/grub/install-grub.pl b/nixos/modules/system/boot/loader/grub/install-grub.pl
index 05fc9900609..570cd2239b0 100644
--- a/nixos/modules/system/boot/loader/grub/install-grub.pl
+++ b/nixos/modules/system/boot/loader/grub/install-grub.pl
@@ -164,7 +164,8 @@ sub GrubFs {
     return Grub->new(path => $path, search => $search);
 }
 my $grubBoot = GrubFs("/boot");
-my $grubStore = GrubFs("/nix/store");
+# FIXME: Should be /nix/store, but this fails in the installer
+my $grubStore = GrubFs("/nix");
 
 # Generate the header.
 my $conf .= "# Automatically generated.  DO NOT EDIT THIS FILE!\n";