diff --git a/src/cryptobox/tests/test.cryptobox.py b/src/cryptobox/tests/test.cryptobox.py
index cfafdc5..0182bbd 100755
--- a/src/cryptobox/tests/test.cryptobox.py
+++ b/src/cryptobox/tests/test.cryptobox.py
@@ -31,6 +31,8 @@ import cryptobox.core.settings
 from cryptobox.tests.base import CommonTestClass
 import os
 
+# which other devices are safe (cannot cause harm)?
+COMMON_ALLOWED_DEVICES = [ '/dev/ubdb' ]
 
 class CryptoBoxDeviceTests(CommonTestClass):
     """Some unittests for the CryptoBox
@@ -41,8 +43,13 @@ class CryptoBoxDeviceTests(CommonTestClass):
 
     def test_allowed_devices(self):
         '''is_device_allowed should accept permitted devices'''
-        self.assertTrue(self.cb.is_device_allowed("/dev/ram1"))
-        self.assertTrue(self.cb.is_device_allowed("/dev/pts/../ram1"))
+        # check if one of the common devices exists and is allowed
+        blockdevice_found = False
+        for dev_node in COMMON_ALLOWED_DEVICES:
+            if os.path.exists(dev_node):
+                self.assertTrue(self.cb.is_device_allowed(dev_node))
+            blockdevice_found = True
+        self.assertTrue(blockdevice_found)
 
 
     def test_denied_devices(self):