diff --git a/Makefile b/Makefile
index 2ea649bbd..84f026180 100644
--- a/Makefile
+++ b/Makefile
@@ -4,13 +4,13 @@ sha = $(shell "git" "rev-parse" "--short" "HEAD")
 dist/spacy.pex : 
 	python3.6 -m venv env3.6
 	source env3.6/bin/activate
-	pip install wheel
-	pip install -r requirements.txt --no-cache-dir --no-binary :all:
-	python setup.py build_ext --inplace
-	python setup.py sdist
-	python setup.py bdist_wheel
-	python -m pip install pex
-	pex dist/*.whl -e spacy -o dist/spacy-$(sha).pex
+	env3.6/bin/pip install wheel
+	env3.6/bin/pip install -r requirements.txt --no-cache-dir --no-binary :all:
+	env3.6/bin/python setup.py build_ext --inplace
+	env3.6/bin/python setup.py sdist
+	env3.6/bin/python setup.py bdist_wheel
+	env3.6/bin/python -m pip install pex
+	env3.6/bin/pex dist/*.whl -e spacy -o dist/spacy-$(sha).pex
 	cp dist/spacy-$(sha).pex dist/spacy.pex
 	chmod a+rx dist/spacy.pex