diff --git a/objectifier-module.nix b/objectifier-module.nix
index cf3d207..c1e5bd3 100644
--- a/objectifier-module.nix
+++ b/objectifier-module.nix
@@ -82,54 +82,56 @@ in {
       };
     };
 
-    systemd.services.objectifier = {
-      after = [ "network-online.target" ];
-      wantedBy = [ "multi-user.target" ];
-      environment = {
-        OBJECTIFIER_YOLOV3_CONFIG = "${pkgs.yolov3-data}/yolov3.cfg";
-        OBJECTIFIER_YOLOV3_WEIGHTS = "${pkgs.yolov3-data}/yolov3.weights";
-        OBJECTIFIER_YOLOV3_LABELS = "${pkgs.yolov3-data}/labels";
-        OBJECTIFIER_BUFFER_SIZE = "524288";
-        OBJECTIFIER_CLEANUP_MAX_AGE = toString cfg.cleanup.max_file_age;
-        OBJECTIFIER_CLEANUP_DELAY = toString cfg.cleanup.delay;
-        OBJECTIFIER_TIMEOUT = toString cfg.detection-timeout;
-        OBJECTIFIER_POOL_SIZE = toString cfg.pool-size;
-      };
-      serviceConfig = {
-        PrivateUsers = true;
-        PrivateDevices = true;
-        PrivateTmp = true;
-        PrivateMounts = true;
-        ProtectControlGroups = true;
-        ProtectKernelTunables = true;
-        ProtectKernelModules = true;
-        ProtectSystem = true;
-        ProtectHostname = true;
-        ProtectHome = true;
-        ProtectClock = true;
-        ProtectKernelLogs = true;
-        # DynamicUser = true;
-        MemoryDenyWriteExecute = true;
-        RestrictRealtime = true;
-        LockPersonality = true;
-        PermissionsStartOnly = true;
-        WorkingDirectory = "${pkgs.objectifier}";
-        StateDirectory = "objectifier";
-        CacheDirectory = "objectifier";
-        RuntimeDirectory = "objectifier";
-        LimitNOFILE = 4096;
-        Restart = "on-failure";
-        RestartSec = "5s";
-        Type = "simple";
-        ExecStart = let
-          bindClause = concatStringsSep " "
-            (map (addr: "--bind ${addr}:${toString cfg.port}")
-              cfg.listen-addresses);
-        in (concatStringsSep " " [
-          "${pkgs.objectifier}/bin/objectifier"
-          bindClause
-          "--workers ${toString cfg.workers}"
-        ]);
+    systemd.services = {
+      objectifier = {
+        after = [ "network-online.target" ];
+        wantedBy = [ "multi-user.target" ];
+        environment = {
+          OBJECTIFIER_YOLOV3_CONFIG = "${pkgs.yolov3-data}/yolov3.cfg";
+          OBJECTIFIER_YOLOV3_WEIGHTS = "${pkgs.yolov3-data}/yolov3.weights";
+          OBJECTIFIER_YOLOV3_LABELS = "${pkgs.yolov3-data}/labels";
+          OBJECTIFIER_BUFFER_SIZE = "524288";
+          OBJECTIFIER_CLEANUP_MAX_AGE = toString cfg.cleanup.max_file_age;
+          OBJECTIFIER_CLEANUP_DELAY = toString cfg.cleanup.delay;
+          OBJECTIFIER_TIMEOUT = toString cfg.detection-timeout;
+          OBJECTIFIER_POOL_SIZE = toString cfg.pool-size;
+        };
+        serviceConfig = {
+          PrivateUsers = true;
+          PrivateDevices = true;
+          PrivateTmp = true;
+          PrivateMounts = true;
+          ProtectControlGroups = true;
+          ProtectKernelTunables = true;
+          ProtectKernelModules = true;
+          ProtectSystem = true;
+          ProtectHostname = true;
+          ProtectHome = true;
+          ProtectClock = true;
+          ProtectKernelLogs = true;
+          # DynamicUser = true;
+          MemoryDenyWriteExecute = true;
+          RestrictRealtime = true;
+          LockPersonality = true;
+          PermissionsStartOnly = true;
+          WorkingDirectory = "${pkgs.objectifier}";
+          StateDirectory = "objectifier";
+          CacheDirectory = "objectifier";
+          RuntimeDirectory = "objectifier";
+          LimitNOFILE = 4096;
+          Restart = "on-failure";
+          RestartSec = "5s";
+          Type = "simple";
+          ExecStart = let
+            bindClause = concatStringsSep " "
+              (map (addr: "--bind ${addr}:${toString cfg.port}")
+                cfg.listen-addresses);
+          in (concatStringsSep " " [
+            "${pkgs.objectifier}/bin/objectifier"
+            bindClause
+            "--workers ${toString cfg.workers}"
+          ]);
+        };
       };
     };
   };
diff --git a/src/objectifier.py b/src/objectifier.py
index 2cec8c6..3c23ab7 100644
--- a/src/objectifier.py
+++ b/src/objectifier.py
@@ -4,7 +4,7 @@ from detector import Detector
 from fastapi import FastAPI, HTTPException, Request, UploadFile, File
 from fastapi.responses import FileResponse
 from os import listdir, remove
-from os.path import getatime, splitext, basename, isfile
+from os.path import getctime, splitext, basename, isfile
 from pathlib import Path
 from threading import Thread
 from time import sleep
@@ -35,7 +35,7 @@ yolo_weights = get_envvar_or_fail('OBJECTIFIER_YOLOV3_WEIGHTS')
 yolo_labels_file = get_envvar_or_fail('OBJECTIFIER_YOLOV3_LABELS')
 buffer_size = to_int(get_envvar('OBJECTIFIER_BUFFER_SIZE')) or 524288
 max_file_age = to_int(get_envvar('OBJECTIFIER_CLEANUP_MAX_AGE'))
-file_cleanup_delay = to_int(get_envvar('OBJECTIFIER_CLEANUP_DELAY'))
+file_cleanup_delay = to_int(get_envvar('OBJECTIFIER_CLEANUP_DELAY')) or 60
 detection_timeout = to_int(get_envvar('OBJECTIFIER_TIMEOUT')) or 5
 pool_size = to_int(get_envvar('OBJECTIFIER_POOL_SIZE')) or 10
 
@@ -61,12 +61,13 @@ img_formats = [ "png", "jpg", "gif", "bmp" ]
 
 def cleanup_old_files(path, extensions, max_age):
     for filename in listdir(path):
-        if (splitext(filename) in extensions) and (getatime(filename) - time.time() > max_age):
+        if (splitext(filename) in extensions) and (getctime(filename) - time.time() > max_age):
             print("removing old output file: " + filename)
             remove(filename)
 
 def run_cleanup_thread(path, extensions, age, delay):
     while True:
+        print("running cleanup thread")
         cleanup_old_files(path, extensions, age)
         sleep(delay)