diff --git a/tox.ini b/tox.ini
index df979a2..99359af 100644
--- a/tox.ini
+++ b/tox.ini
@@ -118,9 +118,13 @@ deps=
     coverage
     simplejson
     pecan
+setenv=
+    PYTHONPATH={toxinidir}
+    COVERAGE_FILE=.coverage.{envname}
+
 commands=
     {envbindir}/coverage run --source wsme {envbindir}/nosetests -w tests/pecantest test/tests/test_ws.py --with-xunit --xunit-file nosetests-{envname}.xml --verbose {posargs}
-    {envbindir}/coverage xml -o coverage-{envname}.xml wsme/*.py wsme/rest/*.py
+    {envbindir}/coverage xml -o coverage-{envname}.xml
     {envbindir}/coverage report --show-missing wsme/*.py wsme/rest/*.py
 
 [testenv:coverage]