diff --git a/taskcluster/ci/source-test/kind.yml b/taskcluster/ci/source-test/kind.yml
index f89e8d4927cd..984f0648d336 100644
--- a/taskcluster/ci/source-test/kind.yml
+++ b/taskcluster/ci/source-test/kind.yml
@@ -36,6 +36,5 @@ jobs-from:
     - wpt-metadata.yml
 
 job-defaults:
-    use-system-python: false
     attributes:
         retrigger: true