diff --git a/lib/ngx/ssl.lua b/lib/ngx/ssl.lua
index d816040d6..2b8f03c12 100644
--- a/lib/ngx/ssl.lua
+++ b/lib/ngx/ssl.lua
@@ -528,11 +528,10 @@ function _M.get_client_random(outlen)
     local out = get_string_buf(outlen)
     local sizep = get_size_ptr()
     sizep[0] = outlen
-    local ret_len = false
 
     local rc = ngx_lua_ffi_ssl_client_random(r, out, sizep, errmsg)
     if rc == FFI_OK then
-        if out_len == 0 then
+        if outlen == 0 then
             return tonumber(sizep[0])
         end