diff --git a/kong/timing/context.lua b/kong/timing/context.lua
index 0d3b4f5c88f40..42e8b905664fd 100644
--- a/kong/timing/context.lua
+++ b/kong/timing/context.lua
@@ -91,9 +91,9 @@ function _M:finalize(subcontext)
 end
 
 
-function _M:get_total_time_without_upstream()
+function _M:get_total_time_without_upstream(context)
   local total_time = 0
-  for k, child in pairs(self.root_context.child) do
+  for k, child in pairs(context.child) do
     if k ~= "upstream" and child.total_time then
       total_time = total_time + child.total_time
     end
@@ -120,7 +120,7 @@ function _M:to_json()
 
   self:set_root_context_prop("dangling", dangling)
   self:finalize(self.root_context)
-  self.root_context.total_time_without_upstream = self:get_total_time_without_upstream()
+  self.root_context.total_time_without_upstream = self:get_total_time_without_upstream(self.root_context)
   return assert(cjson.encode(self.root_context))
 end