diff --git a/tox.ini b/tox.ini
index 601a6c00d..7ca32075c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@ envlist = linters,checkbuild
 skipsdist = True
 
 [testenv]
-basepython = python2.7
+basepython = python3
 setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt
@@ -23,6 +23,7 @@ commands =
   doc8 api-quick-start
 
 [testenv:checkbuild]
+basepython = python2
 commands =
   # Build and copy RST Guides
   {toxinidir}/tools/build-all-rst.sh