diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index 35fa45dbc014..e37142f05f41 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -421,7 +421,7 @@ let
       echo "Usage size: $usage_size"
       echo "Image size: $image_size"
       truncate --size=$image_size "$out"
-      faketime "2000-01-01 00:00:00" mkfs.vfat -i 12345678 -n EFIBOOT "$out"
+      mkfs.vfat --invariant -i 12345678 -n EFIBOOT "$out"
 
       # Force a fixed order in mcopy for better determinism, and avoid file globbing
       for d in $(find EFI -type d | sort); do