diff --git a/wled00/wled.cpp b/wled00/wled.cpp
index 9fe74d5c..abee0ebc 100644
--- a/wled00/wled.cpp
+++ b/wled00/wled.cpp
@@ -473,7 +473,7 @@ void WLED::setup()
   delay(WLED_BOOTUPDELAY); // delay to let voltage stabilize, helps with boot issues on some setups
   #endif
 
-  #if ARDUINO_USB_CDC_ON_BOOT && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6))
+  #if ARDUINO_USB_CDC_ON_BOOT && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32P4))
   Serial.begin(115200);     //  WLEDMM avoid "hung devices" when USB_CDC is enabled; see https://github.com/espressif/arduino-esp32/issues/9043
   Serial.setTxTimeoutMs(0); // potential side-effect: incomplete debug output, with missing characters whenever TX buffer is full.
   #else
@@ -507,8 +507,8 @@ void WLED::setup()
   if (!Serial) delay(2500);  // WLEDMM allow CDC USB serial to initialise (WLED_DEBUG only)
   #endif
   #if ARDUINO_USB_CDC_ON_BOOT || ARDUINO_USB_MODE
-    #if ARDUINO_USB_CDC_ON_BOOT && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6))
-    
+    #if ARDUINO_USB_CDC_ON_BOOT && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32P4))
+    //  WLEDMM avoid "hung devices" when USB_CDC is enabled; see https://github.com/espressif/arduino-esp32/issues/9043
     Serial.setTxTimeoutMs(0);    
     #endif
 #if !defined(WLEDMM_NO_SERIAL_WAIT) || defined(WLED_DEBUG)
diff --git a/wled00/wled_serial.cpp b/wled00/wled_serial.cpp
index fe83fc43..4d5f1f22 100644
--- a/wled00/wled_serial.cpp
+++ b/wled00/wled_serial.cpp
@@ -76,8 +76,8 @@ void sendBytes(){
 }
 
 bool canUseSerial(void) {   // WLEDMM returns true if Serial can be used for debug output (i.e. not configured for other purpose)
-  #if ARDUINO_USB_CDC_ON_BOOT && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6)) && !defined(WLED_DEBUG_HOST)
-  //  on S3/C3/C6, USB CDC blocks if disconnected! so check if Serial is active before printing to it.
+  #if ARDUINO_USB_CDC_ON_BOOT && (defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32P4)) && !defined(WLED_DEBUG_HOST)
+  //  on S3/C3/C6/P4, USB CDC blocks if disconnected! so check if Serial is active before printing to it.
   if (!Serial) return false;
   #endif
   if (pinManager.isPinAllocated(hardwareTX) && (pinManager.getPinOwner(hardwareTX) != PinOwner::DebugOut))