diff --git a/taskcluster/ci/test/tests.yml b/taskcluster/ci/test/tests.yml
index 7cf8d2094899..61d14c34723e 100644
--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -1051,6 +1051,7 @@ reftest-stylo:
     description: "Reftest run for Stylo"
     suite: reftest/reftest-stylo
     treeherder-symbol: tc-R(Rs)
+    docker-image: {"in-tree": "desktop1604-test"}
     chunks: 16
     run-on-projects:
         by-test-platform: