diff --git a/tox.ini b/tox.ini
index 7cca2d415a..55b0f90a17 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,6 +18,12 @@ install_command = pip install -U {opts} -c {toxinidir}/upper-constraints.txt {pa
 deps = -r{toxinidir}/upper-constraints.txt
 commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
 
+[testenv:py35-check-uc]
+basepython = python3.5
+install_command = pip install -U {opts} -c {toxinidir}/upper-constraints.txt {packages}
+deps = -r{toxinidir}/upper-constraints.txt
+commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
+
 [testenv:venv]
 commands = {posargs}