--- a/debian/rules	2019-07-17 09:33:22.956981175 -0300
--- b/debian/rules	2019-07-17 09:45:36.913524618 -0300
@@ -26,7 +26,7 @@
 
 override_dh_sphinxdoc:
 ifeq (,$(findstring nodocs, $(DEB_BUILD_OPTIONS)))
-	PATH=$$PATH:$(CURDIR)/debian/bin PYTHON=python3 python3 -m sphinx -b html doc/source debian/python-os-faults-doc/usr/share/doc/python-os-faults-doc/html
+	PATH=$$PATH:$(CURDIR)/debian/bin PYTHON=python3 PYTHONPATH=$(CURDIR) python3 -m sphinx -b html doc/source debian/python-os-faults-doc/usr/share/doc/python-os-faults-doc/html
 	dh_sphinxdoc
 endif