diff --git a/proxy/http/HttpSM.cc b/proxy/http/HttpSM.cc
index 20b03c2d806..5a03261174a 100644
--- a/proxy/http/HttpSM.cc
+++ b/proxy/http/HttpSM.cc
@@ -4743,6 +4743,9 @@ HttpSM::do_cache_lookup_and_read()
   // ink_assert(server_txn == NULL);
   ink_assert(pending_action.empty());
 
+  t_state.request_sent_time      = UNDEFINED_TIME;
+  t_state.response_received_time = UNDEFINED_TIME;
+
   HTTP_INCREMENT_DYN_STAT(http_cache_lookups_stat);
 
   milestones[TS_MILESTONE_CACHE_OPEN_READ_BEGIN] = Thread::get_hrtime();