diff --git a/tox.ini b/tox.ini
index a6c4b132..a4664a81 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,6 +35,7 @@ deps =
   pytest-sftpserver
   http://quixote.python.ca/releases/Quixote-2.7b2.tar.gz
   vobject
+  django18: django-model-utils<3.2
 commands =
   ./get_wcs.sh
   django18: py.test {posargs: {env:FAST:} --junitxml=test_{envname}_results.xml --cov-report xml --cov-report html --cov=passerelle/ --cov-config .coveragerc tests/}