--- a/taskcluster/taskgraph/task/legacy.py
+++ b/taskcluster/taskgraph/task/legacy.py
@@ -146,17 +146,17 @@ def set_interactive_task(task, interacti
 
 def remove_caches_from_task(task):
     r"""Remove all caches but vcs from the task.
 
     :param task: task definition.
     """
     whitelist = [
         re.compile("^level-[123]-.*-tc-vcs(-public-sources)?$"),
-        re.compile("^level-[123]-hg-shared"),
+        re.compile("^level-[123]-hg-shared$"),
         re.compile("^tooltool-cache$"),
     ]
     try:
         caches = task["task"]["payload"]["cache"]
         scopes = task["task"]["scopes"]
         for cache in caches.keys():
             if not any(pat.match(cache) for pat in whitelist):
                 caches.pop(cache)