diff --git a/tox.ini b/tox.ini
index a7a734ba..9de29fb6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -85,7 +85,9 @@ ignore = E121,E126,E127,E128,E131,E221,E226,E241,E251,E261,E302,E303,E501,E701,F
 
 [testenv:lower-constraints]
 basepython = python3
+setenv = {[testenv:py35]setenv}
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt
+commands = {[testenv:py35]commands}