diff --git a/tox.ini b/tox.ini
index 4f6df4f5764..296e2023087 100644
--- a/tox.ini
+++ b/tox.ini
@@ -51,7 +51,7 @@ commands = false
 setenv = OS_SUDO_TESTING=1
          OS_ROOTWRAP_CMD=sudo {envdir}/bin/neutron-rootwrap {envdir}/etc/neutron/rootwrap.conf
          OS_ROOTWRAP_DAEMON_CMD=sudo {envdir}/bin/neutron-rootwrap-daemon {envdir}/etc/neutron/rootwrap.conf
-         OS_FAIL_ON_MISSING_DEPS=1
+         OS_FAIL_ON_MISSING_DEPS={env:OS_FAIL_ON_MISSING_DEPS:1}
          OS_LOG_PATH={env:OS_LOG_PATH:/opt/stack/logs}
 commands = false