diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index d61916e184a..3c0eccc5dbf 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -473,6 +473,7 @@ pythonPackages = python.modules // rec {
       }' blivet/formats/__init__.py
       sed -i -e 's|"lsof"|"${pkgs.lsof}/bin/lsof"|' blivet/formats/fs.py
       sed -i -r -e 's|"(u?mount)"|"${pkgs.utillinux}/bin/\1"|' blivet/util.py
+      sed -i '/pvscan/s/, *"--cache"//' blivet/devicelibs/lvm.py
     '';
 
     propagatedBuildInputs = let