diff --git a/test/unit/tool_shed/_util.py b/test/unit/tool_shed/_util.py
index 4ef21ab5f322..df50c5270ef2 100644
--- a/test/unit/tool_shed/_util.py
+++ b/test/unit/tool_shed/_util.py
@@ -76,6 +76,7 @@ def __init__(self, temp_directory=None):
         hgweb_config_dir = os.path.join(temp_directory, "hgweb")
         safe_makedirs(hgweb_config_dir)
         self.hgweb_config_manager.hgweb_config_dir = hgweb_config_dir
+        self.hgweb_config_manager.hgweb_repo_prefix = "repos/"
         self.config = TestToolShedConfig(temp_directory)
         self.security = IdEncodingHelper(id_secret=self.config.id_secret)
         self.repository_registry = tool_shed.repository_registry.Registry(self)