diff --git a/tox.ini b/tox.ini
index 56ed19e51..2356ffc74 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,9 @@ envlist = py27, py34, py35, py36, py37, flake8
 commands =
     {envbindir}/py.test --tb=short \
         --junitxml={toxworkdir}/junit-{envname}.xml \
-        --cov=dosagelib --cov-config=tox.ini --cov-branch \
+        --cov={envsitepackagesdir}/dosagelib \
+        --cov-branch \
+        --cov-config=tox.ini \
         --cov-report=term \
         --cov-report=xml:{toxworkdir}/cov-{envname}.xml \
         --cov-report=html:{toxworkdir}/cov-{envname} \