diff --git a/.taskcluster.yml b/.taskcluster.yml
index ad56f93..53b7902 100644
--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -207,7 +207,7 @@ tasks:
                                         ACTION_CALLBACK: '${action.cb_name}'
 
                           cache:
-                              "${trustDomain}-level-${level}-checkouts-sparse-v2": /builds/worker/checkouts
+                              "${trustDomain}-project-${project}-level-${level}-checkouts-sparse-v2": /builds/worker/checkouts
 
                           features:
                               taskclusterProxy: true
diff --git a/reps/templates/python/{{cookiecutter.__project_slug}}/.taskcluster.yml b/reps/templates/python/{{cookiecutter.__project_slug}}/.taskcluster.yml
index 910531b..206df7a 100644
--- a/reps/templates/python/{{cookiecutter.__project_slug}}/.taskcluster.yml
+++ b/reps/templates/python/{{cookiecutter.__project_slug}}/.taskcluster.yml
@@ -218,7 +218,7 @@ tasks:
                                         ACTION_CALLBACK: '${action.cb_name}'
 
                           cache:
-                              "${trustDomain}-level-${level}-checkouts-sparse-v2": /builds/worker/checkouts
+                              "${trustDomain}-project-${project}-level-${level}-checkouts-sparse-v2": /builds/worker/checkouts
 
                           features:
                               taskclusterProxy: true