diff --git a/platformio.ini b/platformio.ini
index 0c9a28c..b690b90 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -148,6 +148,7 @@ build_flags =
 	-DCORE_DEBUG_LEVEL=0
   -DESP32C3
 	-DARDUINO_ESP32C3_DEV
+	-DUSE_SERIAL0
 lib_deps = 
 	${common_env_data.lib_deps}
 	${common_env_data.lib_deps32}
@@ -193,9 +194,8 @@ build_flags =
 	-DCORE_DEBUG_LEVEL=5
 	-DJTAG_DEBUG
   -DESP32C3
+	-DUSE_SERIAL0
 	-DARDUINO_ESP32C3_DEV
-	#-DARDUINO_USB_MODE=1
-	#-DARDUINO_USB_CDC_ON_BOOT=1
 	-DCOLLECT_PERFDATA	# Collect runtime data for a few defined methods to measure time, dumped to serial and/or influxdb 
 lib_deps = 
 	${common_env_data.lib_deps}