diff --git a/lib/resty/http/simple.lua b/lib/resty/http/simple.lua
index aab6d8d..153dc53 100644
--- a/lib/resty/http/simple.lua
+++ b/lib/resty/http/simple.lua
@@ -122,7 +122,7 @@ local function _req_header(self, opts)
     if not headers['Accept'] then
 	headers['Accept'] = "*/*"
     end
-    if version == 0 and not headers['Connection'] then
+    if opts.version == 0 and not headers['Connection'] then
 	headers['Connection'] = "Keep-Alive"
     end