diff --git a/Makefile b/Makefile
index d3b31de1d..c4e77d101 100644
--- a/Makefile
+++ b/Makefile
@@ -24,11 +24,7 @@ endif
 
 
 dist/$(SPACY_BIN) : $(WHEELHOUSE)/spacy-$(PYVER)-$(version).stamp
-	tmp_dir = $(TMPDIR)
-	echo $(tmp_dir)
-	source $(VENV)/bin/activate
-	export TMPDIR=$(tmp_dir)
-	pex \
+	$(VENV)/bin/pex \
 		-f $(WHEELHOUSE) \
 		--no-index \
 		--disable-cache \
@@ -44,14 +40,8 @@ dist/pytest.pex : $(WHEELHOUSE)/pytest-*.whl
 	chmod a+rx $@
 
 $(WHEELHOUSE)/spacy-$(PYVER)-$(version).stamp : $(VENV)/bin/pex setup.py spacy/*.py* spacy/*/*.py*
-	mkdir -p $(WHEELHOUSE)
-	tmp_dir = $(TMPDIR)
-	echo $(tmp_dir)
-	source $(VENV)/bin/activate
-	export TMPDIR=$(tmp_dir)
-	
-	pip wheel . -w $(WHEELHOUSE)
-	pip wheel $(SPACY_EXTRAS) -w $(WHEELHOUSE)
+	$(VENV)/bin/pip wheel . -w $(WHEELHOUSE)
+	$(VENV)/bin/pip wheel $(SPACY_EXTRAS) -w $(WHEELHOUSE)
 
 	touch $@