diff --git a/Source/monster.cpp b/Source/monster.cpp
index f3eeba4cf..d31440ef0 100644
--- a/Source/monster.cpp
+++ b/Source/monster.cpp
@@ -1050,7 +1050,7 @@ void HitMonster(int monsterId, int dam)
 	assert(monsterId >= 0 && monsterId < MaxMonsters);
 	auto &monster = Monsters[monsterId];
 
-	delta_monster_hp(monsterId, monster._mhitpoints, *MyPlayer);
+	delta_monster_hp(monster, *MyPlayer);
 	NetSendCmdMonDmg(false, monsterId, dam);
 	PlayEffect(monster, 1);
 
@@ -3929,7 +3929,7 @@ void M_StartHit(int monsterId, int pnum, int dam)
 
 	monster.mWhoHit |= 1 << pnum;
 	if (pnum == MyPlayerId) {
-		delta_monster_hp(monsterId, monster._mhitpoints, *MyPlayer);
+		delta_monster_hp(monster, *MyPlayer);
 		NetSendCmdMonDmg(false, monsterId, dam);
 	}
 	if (IsAnyOf(monster.type().type, MT_SNEAK, MT_STALKER, MT_UNSEEN, MT_ILLWEAV) || dam >> 6 >= monster.mLevel + 3) {
diff --git a/Source/msg.cpp b/Source/msg.cpp
index 6849f2b5f..3c0cd68bc 100644
--- a/Source/msg.cpp
+++ b/Source/msg.cpp
@@ -1592,7 +1592,7 @@ DWORD OnMonstDamage(const TCmd *pCmd, int pnum)
 				monster._mhitpoints -= message.dwDam;
 				if ((monster._mhitpoints >> 6) < 1)
 					monster._mhitpoints = 1 << 6;
-				delta_monster_hp(message.wMon, monster._mhitpoints, player);
+				delta_monster_hp(monster, player);
 			}
 		}
 	}
@@ -2220,15 +2220,15 @@ void delta_kill_monster(int mi, Point position, const Player &player)
 	pD->_mhitpoints = 0;
 }
 
-void delta_monster_hp(int mi, int hp, const Player &player)
+void delta_monster_hp(const Monster &monster, const Player &player)
 {
 	if (!gbIsMultiplayer)
 		return;
 
 	sgbDeltaChanged = true;
-	DMonsterStr *pD = &GetDeltaLevel(player).monster[mi];
-	if (pD->_mhitpoints > hp)
-		pD->_mhitpoints = hp;
+	DMonsterStr *pD = &GetDeltaLevel(player).monster[monster.getId()];
+	if (pD->_mhitpoints > monster._mhitpoints)
+		pD->_mhitpoints = monster._mhitpoints;
 }
 
 void delta_sync_monster(const TSyncMonster &monsterSync, uint8_t level)
diff --git a/Source/msg.h b/Source/msg.h
index 8a52507d7..27e514ea4 100644
--- a/Source/msg.h
+++ b/Source/msg.h
@@ -722,7 +722,7 @@ void DeltaExportData(int pnum);
 void DeltaSyncJunk();
 void delta_init();
 void delta_kill_monster(int mi, Point position, const Player &player);
-void delta_monster_hp(int mi, int hp, const Player &player);
+void delta_monster_hp(const Monster &monster, const Player &player);
 void delta_sync_monster(const TSyncMonster &monsterSync, uint8_t level);
 uint8_t GetLevelForMultiplayer(const Player &player);
 bool IsValidLevelForMultiplayer(uint8_t level);