diff --git a/manager/tasks.py b/manager/tasks.py
index 9798f76..3e4c667 100644
--- a/manager/tasks.py
+++ b/manager/tasks.py
@@ -21,12 +21,6 @@ def mkfirmware(device, path):
     DEVICEDIR = "/opt/vpnmanager/device-config/%i/" % device.model.id
     SRCDIR = "/opt/vpnmanager/imagebuilder/%i/" % device.model.id
 
-    if glob.glob(SRCDIR + "/.kumilock"):
-        return False
-
-    with open(SRCDIR + "/.kumilock", "w") as lock:
-        lock.write("")
-
     tempdir = tempfile.TemporaryDirectory()
 
     copy_tree(DEVICEDIR, tempdir.name)
@@ -76,14 +70,12 @@ def mkfirmware(device, path):
     try:
         subprocess.call(["/usr/bin/make"])
     except:
-        os.remove(SRCDIR + "/.kumilock")
         os.chdir(BEFORE)
         return False
 
     os.chdir(BEFORE)
 
     os.rename(glob.glob(SRCDIR + "/bin/targets/ar71xx/generic/*squashfs-sysupgrade.bin")[0], "%s/%s.bin" % (path, device.id))
-    os.remove(SRCDIR + "/.kumilock")
     os.system("rm -rf " + SRCDIR + "/files/")
     os.system("rm " + SRCDIR + "/bin/targets/ar71xx/generic/*")
     device.firmware = datetime.datetime.now()