diff --git a/Makefile b/Makefile
index 3f10e79cc..741366063 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ dist/$(SPACY_BIN) : $(WHEELHOUSE)/spacy-$(PYVER)-$(version).stamp
 		--disable-cache \
 		-o $@ \
 		$(package)==$(version) \
-		$(SPACY_EXTRAS)
+		"$(SPACY_EXTRAS)"
 	chmod a+rx $@
 	cp $@ dist/spacy.pex