diff --git a/Server.Packets/PacketForwardingService.cs b/Server.Packets/PacketForwardingService.cs
index 794af3e..8f08b79 100644
--- a/Server.Packets/PacketForwardingService.cs
+++ b/Server.Packets/PacketForwardingService.cs
@@ -17,7 +17,8 @@ public class PacketForwardingService
 		// Get all types that implement IPacket and have a PacketIdAttribute
 		_packets = assembly.GetTypes()
 			.Select(x => (attr: x.GetCustomAttribute<PacketIdAttribute>(), ctor: x.GetConstructor(Type.EmptyTypes)))
-			.Where(x => x.attr != null && x.ctor != null && x.GetType().IsAssignableFrom(typeof(IPacket)))
+			.Where(x => x.attr != null && x.ctor != null && x.GetType().IsAssignableTo(typeof(IPacket)) &&
+			            x.GetType().IsClass)
 			.ToImmutableDictionary(x => x.attr!.PacketId, x => x.ctor)!;
 	}