diff --git a/TShockAPI/GetDataHandlers.cs b/TShockAPI/GetDataHandlers.cs
index ead8b8388..2b15dbc8d 100644
--- a/TShockAPI/GetDataHandlers.cs
+++ b/TShockAPI/GetDataHandlers.cs
@@ -3386,6 +3386,16 @@ private static bool HandleProjectileNew(GetDataHandlerArgs args)
 		}
 
 		private static bool HandleNpcStrike(GetDataHandlerArgs args)
+		{
+			if (!HandleNpcStrikeInner(args))
+				return false;
+
+			// If we don't ack the damage on a rejected packet, the NPC will appear to deplete its health only for that client.
+			args.Player.SendData(PacketTypes.DamageNPCAck);
+			return true;
+		}
+
+		private static bool HandleNpcStrikeInner(GetDataHandlerArgs args)
 		{
 			short id = args.Data.ReadInt8();
 			var generation = args.Data.ReadInt8();