diff --git a/debian/rules b/debian/rules
index d4f3b4a..0ead54f 100755
--- a/debian/rules
+++ b/debian/rules
@@ -21,7 +21,7 @@
 	done
 	rm -rf $(CURDIR)/debian/python*-castellan/usr/lib/python*/dist-packages/*.pth
 
-	oslo-config-generator --output-file $(CURDIR)/debian/python-castellan/etc/castellan/castellan.conf \
+	PYTHONPATH=. oslo-config-generator --output-file $(CURDIR)/debian/python-castellan/etc/castellan/castellan.conf \
 		--wrap-width 140 \
 		--namespace castellan.config