--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -258,16 +258,17 @@ jsreftest:
         by-test-platform:
             android.*: xlarge
             default: default
     chunks:
         by-test-platform:
             android-4.3-arm7-api-15/debug: 35
             android.*: 10
             windows.*: 2
+            linux64-qr/.*: 4
             default: 3
     e10s:
         by-test-platform:
             # Bug 1321782
             windows.*: false
             android.*: false
             linux64-ccov/opt: false
             default: both