diff --git a/OpenRA.Game/Network/OrderManager.cs b/OpenRA.Game/Network/OrderManager.cs
index fad36e8953..5445c34512 100644
--- a/OpenRA.Game/Network/OrderManager.cs
+++ b/OpenRA.Game/Network/OrderManager.cs
@@ -123,7 +123,7 @@ namespace OpenRA.Network
 					var frame = BitConverter.ToInt32(packet, 0);
 					if (packet.Length == 5 && packet[4] == (byte)OrderType.Disconnect)
 						frameData.ClientQuit(clientId, frame);
-					else if (packet.Length >= 5 && packet[4] == (byte)OrderType.SyncHash)
+					else if (packet.Length == 4 + 1 + 4 + 8 && packet[4] == (byte)OrderType.SyncHash)
 						CheckSync(packet);
 					else if (frame == 0)
 						immediatePackets.Add((clientId, packet));