diff --git a/ci/tox.yaml b/ci/tox.yaml
index 3598082e..637c6054 100644
--- a/ci/tox.yaml
+++ b/ci/tox.yaml
@@ -9,6 +9,6 @@
         state: present
       become: yes
     - name: Run tox
-      command: tox
+      command: "{{ tox_executable }}"
       args:
         chdir: '{{ zuul.project.src_dir }}'