diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index 5c5f568db689..a0bca949c6a2 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -722,7 +722,7 @@ in
     "/nix/.ro-store" = lib.mkImageMediaOverride
       { fsType = "squashfs";
         device = "/iso/nix-store.squashfs";
-        options = [ "loop" ];
+        options = [ "loop" "threads=multi" ];
         neededForBoot = true;
       };
 
diff --git a/nixos/modules/installer/netboot/netboot.nix b/nixos/modules/installer/netboot/netboot.nix
index 33301c6423db..0e4f456dce49 100644
--- a/nixos/modules/installer/netboot/netboot.nix
+++ b/nixos/modules/installer/netboot/netboot.nix
@@ -47,7 +47,7 @@ with lib;
     fileSystems."/nix/.ro-store" = mkImageMediaOverride
       { fsType = "squashfs";
         device = "../nix-store.squashfs";
-        options = [ "loop" ];
+        options = [ "loop" "threads=multi" ];
         neededForBoot = true;
       };