diff --git a/tox.ini b/tox.ini
index 927bf89ff8..c2afb392a6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,7 +33,7 @@ commands = python setup.py build_sphinx
 # Use the local upper-constraints.txt file
 deps = Babel
 install_command = pip install -c upper-constraints.txt {opts} {packages}
-commands = tools/babel-test.sh
+commands = {toxinidir}/tools/babel-test.sh
 
 [flake8]
 ignore = H803