diff --git a/src/tests/client/test-client.py b/src/tests/client/test-client.py
index b6f7cf00a..e33317b1a 100755
--- a/src/tests/client/test-client.py
+++ b/src/tests/client/test-client.py
@@ -1009,6 +1009,8 @@ class TestNmClient(unittest.TestCase):
 
         pexp = pexpect.spawn(argv[0], argv[1:], timeout=10, env=env)
 
+        pexp.str_last_chars = 100000
+
         typ = collections.namedtuple("CallPexpect", ["pexp", "valgrind_log"])
         return typ(pexp, valgrind_log)