diff --git a/server/gameserver/ingamevoice.cc b/server/gameserver/ingamevoice.cc
index 40011ebd..98f78e36 100644
--- a/server/gameserver/ingamevoice.cc
+++ b/server/gameserver/ingamevoice.cc
@@ -70,17 +70,17 @@ void InGameVoice::OnHumanBeKill(int killer_id, Human* deader)
     }
     ++global_kills_;
     if (global_kills_ > 0) {
-        if (room_->GetFrameNo() - GetInt64Map(personal_last_kill_frameno_, killer_id) >
+        if (room_->GetFrameNo() - GetLastKillFrameNo(killer_id) >
             SERVER_FRAME_RATE * mt::InGameVoice::s_series_kill_interval) {
             personal_series_kills_.erase(killer_id);
         }
-        personal_last_kill_frameno_[killer_id] = room_->GetFrameNo();
         IncIntMap(personal_kills_, killer_id);
         IncIntMap(personal_series_kills_, killer_id);
         if (!killer->dead) {
             IncIntMap(personal_nodead_series_kills_, killer_id);
         }
     }
+    personal_last_kill_frameno_[killer_id] = room_->GetFrameNo();
     TriggerEvent(killer, deader);
 }
 
@@ -487,3 +487,8 @@ bool InGameVoice::IsSpecSeriesKill(Human* killer, Human* deader)
          });
     return ok;
 }
+
+long long InGameVoice::GetLastKillFrameNo(int killer_id)
+{
+    return GetInt64Map(personal_last_kill_frameno_, killer_id);
+}
diff --git a/server/gameserver/ingamevoice.h b/server/gameserver/ingamevoice.h
index 3f1c8a4a..fcdac03c 100644
--- a/server/gameserver/ingamevoice.h
+++ b/server/gameserver/ingamevoice.h
@@ -18,6 +18,7 @@ class InGameVoice : public std::enable_shared_from_this<InGameVoice>
     void OnHumanRevive(Human* hum);
     void Fail(Team* team);
     void Victory(Team* team);
+    long long GetLastKillFrameNo(int killer_id);
 
 private:
     void UpdateTeamBeKillLastTime(int team_id);