diff --git a/magnum/tests/contrib/post_test_hook.sh b/magnum/tests/contrib/post_test_hook.sh
index 75f8180336..e1b2ef4f12 100755
--- a/magnum/tests/contrib/post_test_hook.sh
+++ b/magnum/tests/contrib/post_test_hook.sh
@@ -50,6 +50,7 @@ source openrc admin admin
 # Bug: #1473600
 unset OS_PROJECT_DOMAIN_ID
 unset OS_USER_DOMAIN_ID
+unset OS_AUTH_TYPE
 popd
 
 # First we test Magnum's command line to see if we can stand up