diff --git a/kfet/open/tests.py b/kfet/open/tests.py
index b4481994..4e652cb6 100644
--- a/kfet/open/tests.py
+++ b/kfet/open/tests.py
@@ -1,5 +1,5 @@
 import json
-import threading
+import random
 from datetime import timedelta
 from unittest import mock
 
@@ -18,7 +18,7 @@ class OpenKfetTest(ChannelTestCase):
 
     def setUp(self):
         self.kfet_open = OpenKfet(
-            cache_prefix="test_kfetopen_%s" % threading.get_ident()
+            cache_prefix="test_kfetopen_%s" % random.randrange(2 ** 20)
         )
         self.addCleanup(self.kfet_open.clear_cache)
 
@@ -138,7 +138,7 @@ class OpenKfetViewsTest(ChannelTestCase):
         self.c_a.login(username="admin", password="admin")
 
         self.kfet_open = OpenKfet(
-            cache_prefix="test_kfetopen_%s" % threading.get_ident()
+            cache_prefix="test_kfetopen_%s" % random.randrange(2 ** 20)
         )
         self.addCleanup(self.kfet_open.clear_cache)
 
@@ -244,7 +244,7 @@ class OpenKfetScenarioTest(ChannelTestCase):
         self.r_c_ws.force_login(self.r)
 
         self.kfet_open = OpenKfet(
-            cache_prefix="test_kfetopen_%s" % threading.get_ident()
+            cache_prefix="test_kfetopen_%s" % random.randrange(2 ** 20)
         )
         self.addCleanup(self.kfet_open.clear_cache)