diff --git a/conftest.py b/conftest.py
index f9ca3ab93..b0ac1badd 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,6 +1,7 @@
 import glob
 import six
 import pytest
+from twisted import version as twisted_version
 
 
 def _py_files(folder):
@@ -26,6 +27,9 @@ collect_ignore = [
 
 ] + _py_files("scrapy/contrib") + _py_files("scrapy/contrib_exp")
 
+if (twisted_version.major, twisted_version.minor, twisted_version.micro) >= (15, 5, 0):
+    collect_ignore += _py_files("scrapy/xlib/tx")
+
 
 if six.PY3:
     for line in open('tests/py3-ignores.txt'):