diff --git a/SerialPorts.c b/SerialPorts.c
index d4b4d97..ddb0fa1 100644
--- a/SerialPorts.c
+++ b/SerialPorts.c
@@ -456,6 +456,7 @@ void SerialPorts_Init(tRs485DirectionPins *directionPins) {
     env->cliVirtualInIo = SerialPortP2p_GetIoFirst(&env->cliVirtualPort);
     env->cliVirtualOutIo = SerialPortP2p_GetIoSecond(&env->cliVirtualPort);
 
-    SerialPortUsb_Init(&env->SerialPortUsb, 1024);
+    SerialPortUsb_Init(&env->SerialPortUsb, 1024, 1024);
     env->SerialPortUsbIO = SerialPortUsb_GetIo(&env->SerialPortUsb);
+    env->SerialPortUsbSnifferIO = SerialPortUsb_GetSnifferIo(&env->SerialPortUsb);
 }
\ No newline at end of file
diff --git a/SerialPorts.h b/SerialPorts.h
index aac941d..0f3d36c 100644
--- a/SerialPorts.h
+++ b/SerialPorts.h
@@ -39,6 +39,7 @@ typedef struct {
 
     tSerialPortUsbArtery SerialPortUsb;
     tSerialPortIO SerialPortUsbIO;
+    tSerialPortIO SerialPortUsbSnifferIO;
 
 } tSerialPorts;