diff --git a/actions/users b/actions/users
index cc557db9a..0a2a032d8 100755
--- a/actions/users
+++ b/actions/users
@@ -24,6 +24,7 @@ Configuration helper for the LDAP user directory
 import argparse
 import os
 import subprocess
+import tempfile
 
 import augeas
 from plinth import action_utils
@@ -159,11 +160,12 @@ Owners: {package}
         override_data += override_template.format(
             package=package, key=key, value=value)
 
-    with open('/tmp/override.dat', 'w') as override_file:
+    with tempfile.NamedTemporaryFile(mode='w', delete=False) as override_file:
         override_file.write(override_data)
 
     env = os.environ.copy()
-    env['DEBCONF_DB_OVERRIDE'] = 'File{/tmp/override.dat readonly:true}'
+    env['DEBCONF_DB_OVERRIDE'] = 'File{' + override_file.name + \
+                                 ' readonly:true}'
     env['DEBIAN_FRONTEND'] = 'noninteractive'
     subprocess.run(['dpkg-reconfigure', package], env=env)