diff --git a/setup.py b/setup.py
index d52456c9..5e6c8729 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,8 @@ import os
 import sys
 
 setup_kwargs = {}
-if sys.argv[1] == "build":
+# dpkg build uses build and install, tox uses sdist
+if sys.argv[1] in ("build", "install"):
     from DistUtilsExtra.command import build_extra
     from DistUtilsExtra.command import build_i18n
     setup_kwargs['cmdclass'] = {'build': build_extra.build_extra,