diff --git a/setup.py b/setup.py
index 4afc6282..ba0fb89a 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@
 	extras_require={
 		'testing': [
 			# upstream
-			'pytest>=3.5',
+			'pytest>=3.5,!=3.7.3',
 			'pytest-sugar>=0.9.1',
 			'collective.checkdocs',
 			'pytest-flake8',