diff --git a/tests/decap/conftest.py b/tests/decap/conftest.py
index 6bc223ba5e9..76186277585 100644
--- a/tests/decap/conftest.py
+++ b/tests/decap/conftest.py
@@ -72,4 +72,5 @@ def pytest_generate_tests(metafunc):
   dscp = metafunc.config.getoption("dscp_uniform")
   if "supported_ttl_dscp_params" in metafunc.fixturenames:
       params = build_ttl_dscp_params({'ttl': ttl, 'dscp': dscp})
-      metafunc.parametrize("supported_ttl_dscp_params", params, ids=lambda p: "ttl=%s, dscp=%s" % (p['ttl'], p['dscp']))
\ No newline at end of file
+      metafunc.parametrize("supported_ttl_dscp_params", params, ids=lambda p: "ttl=%s, dscp=%s" % (p['ttl'], p['dscp']), scope="module")
+