diff --git a/boards/c3_mini_4M.json b/boards/c3_mini_4M.json
index 7f19d1662..a9533e498 100644
--- a/boards/c3_mini_4M.json
+++ b/boards/c3_mini_4M.json
@@ -5,6 +5,7 @@
       },
       "core": "esp32",
       "extra_flags": [
+        "-DTASMOTA_SDK",
         "-DARDUINO_LOLIN_C3_MINI",
         "-DARDUINO_USB_MODE=1",
         "-DARDUINO_USB_CDC_ON_BOOT=1"
diff --git a/platformio.ini b/platformio.ini
index e75b3b384..e02248eb9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -176,10 +176,7 @@ extends = espressif32_base_T_4M
 board = c3_mini_4M
 build_flags =
   ${common.build_flags}
-  -DTASMOTA_SDK
   -DBOARD_C3_MINI_V1
-  -DARDUINO_USB_MODE=1
-  -DARDUINO_USB_CDC_ON_BOOT=1
 
 ; 
 ; Building and testing natively, standalone without an ESP32.