diff --git a/src/toil/test/cwl/cwlTest.py b/src/toil/test/cwl/cwlTest.py
index 4098976352..4b89abb3fe 100644
--- a/src/toil/test/cwl/cwlTest.py
+++ b/src/toil/test/cwl/cwlTest.py
@@ -449,7 +449,7 @@ def test_run_dockstore_trs(self) -> None:
         main_args = [
             "--outdir",
             self.outDir,
-            "#workflow/github.com/dockstore-testing/md5sum-checker",
+            "#workflow/github.com/dockstore-testing/md5sum-checker:master",
             "https://raw.githubusercontent.com/dockstore-testing/md5sum-checker/refs/heads/master/md5sum/md5sum-input-cwl.json"
         ]
         cwltoil.main(main_args, stdout=stdout)