diff --git a/playbooks/tox/run-both.yaml b/playbooks/tox/run-both.yaml
index 0528b46f00..e4043d8231 100644
--- a/playbooks/tox/run-both.yaml
+++ b/playbooks/tox/run-both.yaml
@@ -8,5 +8,4 @@
     - test-setup
     - ensure-tox
     - get-devstack-os-environment
-    - role: tox
-      tox_environment: "{{ os_env_vars|default({}) }}"
+    - tox
diff --git a/playbooks/tox/run.yaml b/playbooks/tox/run.yaml
index 6e549d3655..0d065c6ca2 100644
--- a/playbooks/tox/run.yaml
+++ b/playbooks/tox/run.yaml
@@ -1,5 +1,4 @@
 - hosts: all
   roles:
     - get-devstack-os-environment
-    - role: tox
-      tox_environment: "{{ os_env_vars|default({}) }}"
+    - tox
diff --git a/roles/get-devstack-os-environment/defaults/main.yaml b/roles/get-devstack-os-environment/defaults/main.yaml
index 73ecfe920c..f68ea560d0 100644
--- a/roles/get-devstack-os-environment/defaults/main.yaml
+++ b/roles/get-devstack-os-environment/defaults/main.yaml
@@ -3,3 +3,4 @@ openrc_file: "{{ devstack_base_dir }}/devstack/openrc"
 openrc_user: admin
 openrc_project: admin
 openrc_enable_export: false
+tox_environment: {}
diff --git a/roles/get-devstack-os-environment/tasks/main.yaml b/roles/get-devstack-os-environment/tasks/main.yaml
index 8c8df7f96d..b2c5e93ed4 100644
--- a/roles/get-devstack-os-environment/tasks/main.yaml
+++ b/roles/get-devstack-os-environment/tasks/main.yaml
@@ -9,6 +9,6 @@
         executable: "/bin/bash"
       register: env_os
 
-    - name: Save the OS_ environment variables as a fact
+    - name: Append the the OS_ environment variables to tox_environment
       set_fact:
-        os_env_vars: "{{ env_os.stdout|from_yaml }}"
+        tox_environment: "{{ env_os.stdout|from_yaml|default({})|combine(tox_environment) }}"