diff --git a/openstack/os-service-types/os-service-types.spec.j2 b/openstack/os-service-types/os-service-types.spec.j2
index cde866437..8ff38a667 100644
--- a/openstack/os-service-types/os-service-types.spec.j2
+++ b/openstack/os-service-types/os-service-types.spec.j2
@@ -65,7 +65,7 @@ This package contains the documentation.
 rm os_service_types/tests/test_remote.py
 
 %build
-%{python_build}
+%{py3_build}
 
 # generate html docs
 PBR_VERSION=%{version} %sphinx_build -b html doc/source doc/build/html