diff --git a/src/game_party.cpp b/src/game_party.cpp
index 9696eb9e1..01085da81 100644
--- a/src/game_party.cpp
+++ b/src/game_party.cpp
@@ -202,6 +202,7 @@ void Game_Party::AddItem(int item_id, int amount) {
 	}
 
 	int total_items = data.item_counts[idx] + amount;
+	GMI().ItemSet(item_id, total_items);
 
 	if (total_items <= 0) {
 		data.item_ids.erase(data.item_ids.begin() + idx);
diff --git a/src/multiplayer/game_multiplayer.cpp b/src/multiplayer/game_multiplayer.cpp
index ccd8688e9..c567b3a45 100644
--- a/src/multiplayer/game_multiplayer.cpp
+++ b/src/multiplayer/game_multiplayer.cpp
@@ -213,6 +213,15 @@ void Game_Multiplayer::InitConnection() {
 			sync_action_events.push_back(p.event_id);
 		}
 	});
+	connection.RegisterHandler<SyncItemPacket>("si", [this] (SyncItemPacket& p) {
+		int count = (int) Main_Data::game_party->GetItemCount(p.item_id);
+		if (p.sync_type != -1) {
+			connection.SendPacketAsync<Messages::C2S::SyncItemPacket>(p.item_id, count);
+		}
+		if (p.sync_type >= -1) {
+			sync_items.push_back(p.item_id);
+		}
+	});
 	connection.RegisterHandler<SyncPicturePacket>("sp", [this] (SyncPicturePacket& p) {
 		sync_picture_names.push_back(p.picture_name);
 	});
@@ -535,6 +544,7 @@ void Game_Multiplayer::Initialize() {
 	players.clear();
 	sync_switches.clear();
 	sync_vars.clear();
+	sync_items.clear();
 	sync_events.clear();
 	sync_action_events.clear();
 	sync_picture_names.clear();
@@ -767,6 +777,12 @@ void Game_Multiplayer::VariableSet(int var_id, int value) {
 	}
 }
 
+void Game_Multiplayer::ItemSet(int item_id, int count) {
+	if (std::find(sync_items.begin(), sync_items.end(), item_id) != sync_items.end()) {
+		connection.SendPacketAsync<Messages::C2S::SyncItemPacket>(item_id, count);
+	}
+}
+
 void Game_Multiplayer::ApplyScreenTone() {
 	ApplyTone(Main_Data::game_screen->GetTone());
 }
diff --git a/src/multiplayer/game_multiplayer.h b/src/multiplayer/game_multiplayer.h
index c3435c3a3..d4dbd9ad0 100644
--- a/src/multiplayer/game_multiplayer.h
+++ b/src/multiplayer/game_multiplayer.h
@@ -47,6 +47,7 @@ class Game_Multiplayer {
 	void ApplyScreenTone();
 	void SwitchSet(int switch_id, int value);
 	void VariableSet(int var_id, int value);
+	void ItemSet(int item_id, int count);
   void UpdateNBPlayers();
   void UpdateCUTime();
   void UpdateCUWeather();
@@ -101,6 +102,7 @@ class Game_Multiplayer {
 	std::vector<PlayerOther> dc_players;
 	std::vector<int> sync_switches;
 	std::vector<int> sync_vars;
+	std::vector<int> sync_items;
 	std::vector<int> sync_events;
 	std::vector<int> sync_action_events;
 	std::vector<std::string> sync_picture_names; // for badge conditions
diff --git a/src/multiplayer/messages.h b/src/multiplayer/messages.h
index 9a4ebbccc..2bdc2e1ed 100644
--- a/src/multiplayer/messages.h
+++ b/src/multiplayer/messages.h
@@ -331,6 +331,15 @@ namespace S2C {
 		const int trigger_type;
 	};
 
+	class SyncItemPacket : public S2CPacket {
+	public:
+		SyncItemPacket(const PL& v)
+			: item_id(Decode<int>(v.at(0))), sync_type(Decode<int>(v.at(1))) {}
+
+		const int item_id;
+		const int sync_type;
+	};
+
 	class SyncPicturePacket : public S2CPacket {
 	public:
 		SyncPicturePacket(const PL& v)
@@ -616,6 +625,15 @@ namespace C2S {
 		int action_bin;
 	};
 
+	class SyncItemPacket : public C2SPacket {
+	public:
+		SyncItemPacket(int _item_id, int _count) : C2SPacket("si"),
+		    item_id(_item_id), count(_count) {}
+		std::string ToBytes() const override { return Build(item_id, count); }
+	protected:
+		int item_id;
+		int count;
+	};
 }
 }