diff --git a/src/mozilla_taskgraph/worker_types.py b/src/mozilla_taskgraph/worker_types.py
index 3bac674..93e9a10 100644
--- a/src/mozilla_taskgraph/worker_types.py
+++ b/src/mozilla_taskgraph/worker_types.py
@@ -297,6 +297,10 @@ def process_l10n_bump_info(info):
                 {
                     Required("early-to-late-beta"): {
                         Required("to-branch"): str,
+                        # technically not used, but passing it keeps landoscript
+                        # code cleaner, so we may as well require a real value
+                        # for it.
+                        Required("fetch-version-from"): str,
                         Optional("replacements"): [[str]],
                     },
                 },
diff --git a/test/test_worker_types.py b/test/test_worker_types.py
index f375dd9..c8a381b 100644
--- a/test/test_worker_types.py
+++ b/test/test_worker_types.py
@@ -907,6 +907,7 @@ def test_lando_merge_early_to_late_beta(build_payload):
                         ]
                     ],
                     "to-branch": "to-b",
+                    "fetch-version-from": "foo/bar.txt",
                 }
             }
         ],
@@ -925,6 +926,7 @@ def test_lando_merge_early_to_late_beta(build_payload):
                     ]
                 ],
                 "to_branch": "to-b",
+                "fetch_version_from": "foo/bar.txt",
             },
         },
         "scopes": [