diff --git a/MLAPI/MonoBehaviours/Core/NetworkingManager.cs b/MLAPI/MonoBehaviours/Core/NetworkingManager.cs
index 0663d0bc2b..e750a425de 100644
--- a/MLAPI/MonoBehaviours/Core/NetworkingManager.cs
+++ b/MLAPI/MonoBehaviours/Core/NetworkingManager.cs
@@ -195,7 +195,7 @@ internal void InvokeOnIncomingCustomMessage(ulong clientId, Stream stream)
         /// <param name="stream">The message stream containing the data</param>
         /// <param name="channel">The channel to send the data on</param>
         /// <param name="security">The security settings to apply to the message</param>
-        public void SendCustomMessage(List<uint> clientIds, BitStream stream, string channel = null, SecuritySendFlags security = SecuritySendFlags.None)
+        public void SendCustomMessage(List<ulong> clientIds, BitStream stream, string channel = null, SecuritySendFlags security = SecuritySendFlags.None)
         {
             if (!IsServer)
             {