diff --git a/test/suite_dfilter/dfiltertest.py b/test/suite_dfilter/dfiltertest.py
index de10c6fd21..09ea0d966c 100644
--- a/test/suite_dfilter/dfiltertest.py
+++ b/test/suite_dfilter/dfiltertest.py
@@ -51,7 +51,7 @@ def checkDFilterFail(cmd_dftest, base_env):
                                 universal_newlines=True,
                                 env=base_env)
         outs, errs = proc.communicate()
-        assert errs.strip() == 'dftest: %s' % (error_message,), \
+        assert error_message in errs, \
             'Unexpected dftest stderr:\n%s\nstdout:\n%s' % (errs, outs)
         assert proc.returncode == 2, \
             'Unexpected dftest exit code: %d. stdout:\n%s\n' % \
diff --git a/test/suite_dfilter/group_tvb.py b/test/suite_dfilter/group_tvb.py
index ad4ed4a585..4ba875769b 100644
--- a/test/suite_dfilter/group_tvb.py
+++ b/test/suite_dfilter/group_tvb.py
@@ -69,5 +69,5 @@ class case_tvb(unittest.TestCase):
 
     def test_protocol_2(self, checkDFilterFail):
         dfilter = 'frame contains aa.bb.hh'
-        checkDFilterFail(dfilter, '"aa.bb.hh" is not a valid byte string.')
+        checkDFilterFail(dfilter, 'not a valid byte string.')