diff --git a/lib/resty/upload.lua b/lib/resty/upload.lua
index 37da961..66dae98 100644
--- a/lib/resty/upload.lua
+++ b/lib/resty/upload.lua
@@ -5,7 +5,6 @@
 local req_socket = ngx.req.socket
 local match = string.match
 local setmetatable = setmetatable
-local type = type
 local ngx_var = ngx.var
 -- local print = print
 
@@ -33,10 +32,6 @@ local function get_boundary()
         return nil
     end
 
-    if type(header) == "table" then
-        header = header[1]
-    end
-
     local m = match(header, ";%s*boundary=\"([^\"]+)\"")
     if m then
         return m