diff --git a/nixos/modules/services/backup/zfs-replication.nix b/nixos/modules/services/backup/zfs-replication.nix
index f6dc40171d1b0..ed635a35617be 100644
--- a/nixos/modules/services/backup/zfs-replication.nix
+++ b/nixos/modules/services/backup/zfs-replication.nix
@@ -92,7 +92,7 @@ in
             ++ (lib.optional cfg.followDelete "--follow-delete")
           );
         in
-        "${lib.getExe cfg.package} ${lib.concatStringSep " " args}";
+        "${lib.getExe cfg.package} ${lib.concatStringsSep " " args}";
       wantedBy = [
         "zfs-snapshot-daily.service"
         "zfs-snapshot-frequent.service"