diff --git a/boards/heltec_v4.json b/boards/heltec_v4.json
index 8eac3a9b2..9827be83f 100644
--- a/boards/heltec_v4.json
+++ b/boards/heltec_v4.json
@@ -9,7 +9,7 @@
     "extra_flags": [
       "-DBOARD_HAS_PSRAM",
       "-DARDUINO_USB_CDC_ON_BOOT=1",
-      "-DARDUINO_USB_MODE=0",
+      "-DARDUINO_USB_MODE=1",
       "-DARDUINO_RUNNING_CORE=1",
       "-DARDUINO_EVENT_RUNNING_CORE=1"
     ],