--- a/debian/rules	2019-07-18 09:23:33.840540525 -0300
--- b/debian/rules	2019-07-18 09:42:30.420115511 -0300
@@ -22,7 +22,7 @@
 
 override_dh_sphinxdoc:
 ifeq (,$(findstring nodoc, $(DEB_BUILD_OPTIONS)))
-	PYTHONPATH=. python3 -m sphinx -b html doc/source $(CURDIR)/debian/python-manilaclient-doc/usr/share/doc/python-manilaclient-doc/html
+	PATH=$$PATH:$(CURDIR)/debian/python3-manilaclient/usr/bin PYTHONPATH=$(CURDIR) python3 -m sphinx -b html doc/source $(CURDIR)/debian/python-manilaclient-doc/usr/share/doc/python-manilaclient-doc/html
 	dh_sphinxdoc
 endif