diff --git a/third_party/2and3/requests/utils.pyi b/third_party/2and3/requests/utils.pyi
index 945277afc..9c03929f6 100644
--- a/third_party/2and3/requests/utils.pyi
+++ b/third_party/2and3/requests/utils.pyi
@@ -40,6 +40,7 @@ def address_in_network(ip, net): ...
 def dotted_netmask(mask): ...
 def is_ipv4_address(string_ip): ...
 def is_valid_cidr(string_network): ...
+def set_environ(env_name, value): ...
 def should_bypass_proxies(url): ...
 def get_environ_proxies(url): ...
 def default_user_agent(name=...): ...