diff --git a/boards/pico.json b/boards/pico.json
index 852ab2b..4a2dc67 100644
--- a/boards/pico.json
+++ b/boards/pico.json
@@ -2,7 +2,7 @@
   "build": {
     "core": "arduino",
     "cpu": "cortex-m0plus",
-    "extra_flags": "-D RASPBERRY_PI_PICO -DARDUINO_ARCH_RP2040",
+    "extra_flags": "-D ARDUINO_RASPBERRY_PI_PICO -DARDUINO_ARCH_RP2040",
     "f_cpu": "133000000L",
     "hwids": [
       [