diff --git a/nixos/modules/services/misc/paperless-ng.nix b/nixos/modules/services/misc/paperless-ng.nix
index 44efc234a2b..11e44f5ece5 100644
--- a/nixos/modules/services/misc/paperless-ng.nix
+++ b/nixos/modules/services/misc/paperless-ng.nix
@@ -214,6 +214,8 @@ in
         User = cfg.user;
         ExecStart = "${cfg.package}/bin/paperless-ng qcluster";
         Restart = "on-failure";
+        # The `mbind` syscall is needed for running the classifier.
+        SystemCallFilter = defaultServiceConfig.SystemCallFilter ++ [ "mbind" ];
       };
       environment = env;
       wantedBy = [ "multi-user.target" ];