diff --git a/irclog.py b/irclog.py
index 269db0a..9fb309c 100644
--- a/irclog.py
+++ b/irclog.py
@@ -859,7 +859,7 @@ class WebServer:
 			authHeader = request.headers.get('Authorization')
 			if not authHeader or authHeader != auth:
 				self.logger.info(f'Bad request {id(request)}: authentication failed: {authHeader!r} != {auth}')
-				raise aiohttp.web.HTTPUnauthorized(headers = {'WWW-Authenticate': f'Basic, realm="{request.match_info["path"]}"'})
+				raise aiohttp.web.HTTPUnauthorized(headers = {'WWW-Authenticate': f'Basic realm="{request.match_info["path"]}"'})
 
 	async def _channel_handler(self, request, handler):
 		await self._check_valid_channel(request)