diff --git a/lualib/http/internal.lua b/lualib/http/internal.lua
index db56ab2b..204767be 100644
--- a/lualib/http/internal.lua
+++ b/lualib/http/internal.lua
@@ -168,8 +168,8 @@ function M.request(interface, method, host, url, recvheader, header, content)
 	local write = interface.write
 	local header_content = ""
 	if header then
-		if not header.host then
-			header.host = host
+		if not header.Host then
+			header.Host = host
 		end
 		for k,v in pairs(header) do
 			header_content = string.format("%s%s:%s\r\n", header_content, k, v)