diff --git a/src/vs/platform/request/common/request.ts b/src/vs/platform/request/common/request.ts
index acb9e55382405..f20c668c27fe1 100644
--- a/src/vs/platform/request/common/request.ts
+++ b/src/vs/platform/request/common/request.ts
@@ -87,7 +87,7 @@ Registry.as<IConfigurationRegistry>(Extensions.Configuration)
 		properties: {
 			'http.proxy': {
 				type: 'string',
-				pattern: '^https?://([^:]*(:[^@]*)?@)?([^:]+)(:\\d+)?/?$|^$',
+				pattern: '^https?://([^:]*(:[^@]*)?@)?([^:]+|\\[[:0-9a-fA-F]+\\])(:\\d+)?/?$|^$',
 				description: localize('proxy', "The proxy setting to use. If not set will be taken from the http_proxy and https_proxy environment variables.")
 			},
 			'http.proxyStrictSSL': {