diff --git a/library.properties b/library.properties
index 6b5b6ca..2b70fa9 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=ESP32TinyUSB
-version=1.3.2
+version=1.3.4
 author=Dariusz Krempa <esp32@esp32.eu.org>
 maintainer=Dariusz Krempa <esp32@esp32.eu.org>
 sentence=USB functions for ESP32-S2
diff --git a/src/classes/cdc/cdcusb.cpp b/src/classes/cdc/cdcusb.cpp
index b9af9d2..209b747 100644
--- a/src/classes/cdc/cdcusb.cpp
+++ b/src/classes/cdc/cdcusb.cpp
@@ -4,7 +4,7 @@
 
 #if CFG_TUD_CDC
 
-#define EPNUM_CDC   0x03
+#define EPNUM_CDC   0x02
 
 static CDCusb* _CDCusb[2] = {};
 enum { CDC_LINE_IDLE, CDC_LINE_1, CDC_LINE_2, CDC_LINE_3 };
@@ -25,7 +25,7 @@ void CDCusb::setBaseEP(uint8_t ep)
 bool CDCusb::begin(char* str)
 {
     // Interface number, string index, EP notification address and size, EP data address (out, in) and size.
-    uint8_t cdc[TUD_CDC_DESC_LEN] = {TUD_CDC_DESCRIPTOR(ifIdx, 4, (uint8_t)(0x80 | (_EPNUM_CDC + 2)), 8, (uint8_t)_EPNUM_CDC, (uint8_t)(0x81 + _EPNUM_CDC), 64)};
+    uint8_t cdc[TUD_CDC_DESC_LEN] = {TUD_CDC_DESCRIPTOR(ifIdx, 4, (uint8_t)(0x80 | (_EPNUM_CDC - 1)), 8, (uint8_t)_EPNUM_CDC, (uint8_t)(0x80 | _EPNUM_CDC), 64)};
     memcpy(&desc_configuration[total], cdc, sizeof(cdc));
     total += sizeof(cdc);
     ifIdx += 2;