--- a/tox.ini	Mon Nov 14 16:23:22 2016 +0000
+++ b/tox.ini	Thu Nov 17 16:14:21 2016 +0100
@@ -41,7 +41,7 @@
 deps =
   check-manifest
 commands =
-  check-manifest {toxinidir} \
+  {envpython} -m check_manifest {toxinidir} \
 # ignore symlinks that are not recognized by check-manifest, see
 # https://github.com/mgedmin/check-manifest/issues/69
     --ignore cubicweb/devtools/test/data/cubes/i18ntestcube*,cubicweb/test/data/legacy_cubes*