diff --git a/src/map/clif.cpp b/src/map/clif.cpp
index 2bfc58edbb..506ffbe0c0 100644
--- a/src/map/clif.cpp
+++ b/src/map/clif.cpp
@@ -9217,24 +9217,21 @@ void clif_guild_delalliance(map_session_data *sd,int guild_id,int flag)
 }
 
 
-/// Notifies the client about the result of a opposition request (ZC_ACK_REQ_HOSTILE_GUILD).
-/// 0181 <result>.B
+/// Notifies the client about the result of a opposition request. 
+/// 0181 <result>.B (ZC_ACK_REQ_HOSTILE_GUILD)
 /// result:
 ///     0 = Antagonist has been set.
 ///     1 = Guild has too many Antagonists.
 ///     2 = Already set as an Antagonist.
 ///     3 = Antagonists are disabled.
-void clif_guild_oppositionack(map_session_data *sd,int flag)
-{
-	int fd;
+void clif_guild_oppositionack(map_session_data& sd,uint8 flag){
 
-	nullpo_retv(sd);
+	PACKET_ZC_ACK_REQ_HOSTILE_GUILD p{};
 
-	fd=sd->fd;
-	WFIFOHEAD(fd,packet_len(0x181));
-	WFIFOW(fd,0)=0x181;
-	WFIFOB(fd,2)=flag;
-	WFIFOSET(fd,packet_len(0x181));
+	p.packetType = HEADER_ZC_ACK_REQ_HOSTILE_GUILD;
+	p.flag = flag;
+
+	clif_send(&p,sizeof(p),&sd.bl,SELF);
 }
 
 
diff --git a/src/map/clif.hpp b/src/map/clif.hpp
index 1dfddd9a24..2939bb9bbb 100644
--- a/src/map/clif.hpp
+++ b/src/map/clif.hpp
@@ -1061,7 +1061,7 @@ void clif_guild_message( const struct mmo_guild& g, uint32 account_id, const cha
 void clif_guild_reqalliance(map_session_data& sd,uint32 account_id,const char *name);
 void clif_guild_allianceack(map_session_data *sd,int flag);
 void clif_guild_delalliance(map_session_data *sd,int guild_id,int flag);
-void clif_guild_oppositionack(map_session_data *sd,int flag);
+void clif_guild_oppositionack(map_session_data& sd,uint8 flag);
 void clif_guild_broken( map_session_data& sd, int flag );
 void clif_guild_xy( map_session_data& sd );
 void clif_guild_xy_single( map_session_data& sd, map_session_data& tsd );
diff --git a/src/map/clif_packetdb.hpp b/src/map/clif_packetdb.hpp
index af9465fdcf..2f9e5d902c 100644
--- a/src/map/clif_packetdb.hpp
+++ b/src/map/clif_packetdb.hpp
@@ -204,7 +204,6 @@
 	parseable_packet(0x017e,-1,clif_parse_GuildMessage,2,4);
 	packet(0x017f,-1);
 	parseable_packet(0x0180,6,clif_parse_GuildOpposition,2);
-	packet(0x0181,3);
 	packet(0x0182,106);
 	parseable_packet(0x0183,10,clif_parse_GuildDelAlliance,2,6);
 	packet(0x0184,10);
diff --git a/src/map/guild.cpp b/src/map/guild.cpp
index 660ad64f6f..ecbd64b749 100644
--- a/src/map/guild.cpp
+++ b/src/map/guild.cpp
@@ -1996,14 +1996,14 @@ int guild_opposition(map_session_data *sd,map_session_data *tsd) {
 		return 0;
 
 	if( guild_get_alliance_count(g->guild,1) >= battle_config.max_guild_alliance )	{
-		clif_guild_oppositionack(sd,1);
+		clif_guild_oppositionack(*sd,1);
 		return 0;
 	}
 
 	for (i = 0; i < MAX_GUILDALLIANCE; i++) { // checking relations
 		if(g->guild.alliance[i].guild_id==tsd->status.guild_id){
 			if (g->guild.alliance[i].opposition == 1) { // check if not already hostile
-				clif_guild_oppositionack(sd,2);
+				clif_guild_oppositionack(*sd,2);
 				return 0;
 			}
 			if(is_agit_start()) // Prevent the changing of alliances to oppositions during WoE.
@@ -2082,7 +2082,7 @@ int guild_allianceack(int guild_id1,int guild_id2,uint32 account_id1,uint32 acco
 			clif_guild_allianceack(sd[1],2);
 	} else if ((flag & 0x0f) == 1) { // enemy notification
 		if( sd[0]!=nullptr )
-			clif_guild_oppositionack(sd[0],0);
+			clif_guild_oppositionack(*sd[0],0);
 	}
 
 
diff --git a/src/map/packets.hpp b/src/map/packets.hpp
index 224cb01bab..c38328a23f 100644
--- a/src/map/packets.hpp
+++ b/src/map/packets.hpp
@@ -767,6 +767,12 @@ struct PACKET_ZC_REQ_ALLY_GUILD {
 } __attribute__((packed));
 DEFINE_PACKET_HEADER(ZC_REQ_ALLY_GUILD, 0x171)
 
+struct PACKET_ZC_ACK_REQ_HOSTILE_GUILD {
+	int16 packetType;
+	uint8 flag;
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_ACK_REQ_HOSTILE_GUILD, 0x181)
+
 struct PACKET_ZC_COMPASS {
 	int16 packetType;
 	uint32 npcId;