diff --git a/cores/rp2040/main.cpp b/cores/rp2040/main.cpp
index 44647dec0..1495ce1e6 100644
--- a/cores/rp2040/main.cpp
+++ b/cores/rp2040/main.cpp
@@ -20,6 +20,7 @@
 
 #include <Arduino.h>
 #include "RP2040USB.h"
+#include <pico/stdlib.h>
 #include <pico/multicore.h>
 
 RP2040 rp2040;