diff --git a/tox.ini b/tox.ini
index 7fd8822..304240e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,7 @@ env_list =
 
 [testenv]
 package = wheel
+wheel_build_env = .pkg
 deps =
     -r requirements/{envname}.txt
 set_env =