diff --git a/nixos/modules/tasks/filesystems/zfs.nix b/nixos/modules/tasks/filesystems/zfs.nix
index 9ca7c6fb3431ba..8589797e0bbffb 100644
--- a/nixos/modules/tasks/filesystems/zfs.nix
+++ b/nixos/modules/tasks/filesystems/zfs.nix
@@ -507,6 +507,7 @@ in
               Type = "oneshot";
               RemainAfterExit = true;
             };
+            environment.ZFS_FORCE = optionalString cfgZfs.forceImportAll "-f";
             script = (importLib {
               # See comments at importLib definition.
               zpoolCmd="${packages.zfsUser}/sbin/zpool";