diff --git a/tox.ini b/tox.ini
index b3fb52ae3..f9b668bb4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,8 +12,8 @@ isolated_build = true
 isolated_build = true
 usedevelop = false
 deps =
-    pytest; python_version != "3.5"
-    pytest<5.4; python_version == "3.5"
+    pytest; python_version != "3.5" or system_platform != "darwin"
+    pytest<5.4; python_version == "3.5" and system_platform == "darwin"
     pytest-xdist
 commands =
     {envpython} -m pytest {posargs:}