diff --git a/test/asf/test_string.py b/test/asf/test_string.py
index 3a861ef..2eeecd7 100644
--- a/test/asf/test_string.py
+++ b/test/asf/test_string.py
@@ -2,11 +2,10 @@
 
 import unittest
 
-from asfframework import VppTestCase, VppTestRunner
-from vpp_ip_route import VppIpTable, VppIpRoute, VppRoutePath
+from asfframework import VppAsfTestCase, VppTestRunner
 
 
-class TestString(VppTestCase):
+class TestString(VppAsfTestCase):
     """String Test Cases"""
 
     @classmethod