diff --git a/cpp/devices/scsi_host_bridge.cpp b/cpp/devices/scsi_host_bridge.cpp
index 93fd0715c2..549f119dfa 100644
--- a/cpp/devices/scsi_host_bridge.cpp
+++ b/cpp/devices/scsi_host_bridge.cpp
@@ -338,7 +338,7 @@ void SCSIBR::GetPacketBuf(vector<uint8_t>& buf, int index)
 	packet_enable = false;
 }
 
-void SCSIBR::SendPacket(span<const uint8_t> buf, int len)
+void SCSIBR::SendPacket(span<const uint8_t> buf, int len) const
 {
 	tap.Send(buf.data(), len);
 }
diff --git a/cpp/devices/scsi_host_bridge.h b/cpp/devices/scsi_host_bridge.h
index d2d3ff0a76..5796822002 100644
--- a/cpp/devices/scsi_host_bridge.h
+++ b/cpp/devices/scsi_host_bridge.h
@@ -52,7 +52,7 @@ class SCSIBR : public PrimaryDevice, public ByteWriter
 	void SetMacAddr(span<const uint8_t>);		// Set MAC address
 	void ReceivePacket();						// Receive a packet
 	void GetPacketBuf(vector<uint8_t>&, int);	// Get a packet
-	void SendPacket(span<const uint8_t>, int);	// Send a packet
+	void SendPacket(span<const uint8_t>, int) const;	// Send a packet
 
 	CTapDriver tap;								// TAP driver
 	bool m_bTapEnable = false;					// TAP valid flag