diff --git a/.coveragerc b/.coveragerc
index 7a2f4b47c..5f833c94a 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1,4 +1,4 @@
 [run]
 branch = True
 omit =
-  pip/_vendor/*
+  src/pip/_vendor/*
diff --git a/.gitignore b/.gitignore
index 417786fac..1d842203b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,7 @@ docs/build/
 
 # Unit test / coverage reports
 .tox/
+htmlcov/
 .coverage
 .coverage.*
 .cache
diff --git a/dev-requirements.txt b/dev-requirements.txt
index a1bfbb6ee..25549125e 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -2,6 +2,7 @@ freezegun
 pretend
 pytest
 pytest-catchlog
+pytest-cov
 pytest-rerunfailures
 pytest-timeout
 pytest-xdist
diff --git a/tox.ini b/tox.ini
index cb5a262cc..e5cd70a57 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,10 @@ commands = py.test --timeout 300 []
 install_command = python -m pip install {opts} {packages}
 usedevelop = True
 
+[testenv:coverage-py3]
+basepython = python3
+commands = py.test --timeout 300 --cov=pip --cov-report=term-missing --cov-report=xml --cov-report=html tests/unit {posargs}
+
 [testenv:docs]
 deps = -r{toxinidir}/docs-requirements.txt
 basepython = python2.7