diff --git a/ports/raspberrypi/mpconfigport.h b/ports/raspberrypi/mpconfigport.h
index 7431519317..77d1ff0805 100644
--- a/ports/raspberrypi/mpconfigport.h
+++ b/ports/raspberrypi/mpconfigport.h
@@ -27,6 +27,8 @@
 #ifndef __INCLUDED_MPCONFIGPORT_H
 #define __INCLUDED_MPCONFIGPORT_H
 
+#define MICROPY_PY_SYS_PLATFORM                     "RP2040"
+
 #define CIRCUITPY_INTERNAL_NVM_SIZE 0
 
 #define CIRCUITPY_DEFAULT_STACK_SIZE                (24*1024)