diff --git a/ports/samd/mpconfigport.h b/ports/samd/mpconfigport.h
index c983d7e6d669c..ef604f980654b 100644
--- a/ports/samd/mpconfigport.h
+++ b/ports/samd/mpconfigport.h
@@ -61,6 +61,7 @@
 #define MICROPY_SCHEDULER_STATIC_NODES      (1)
 #define MICROPY_HW_ENABLE_USBDEV            (1)
 #define MICROPY_HW_USB_CDC_1200BPS_TOUCH    (1)
+#define MICROPY_USE_INTERNAL_ERRNO          (1)
 
 // Control over Python builtins
 #define MICROPY_PY_BUILTINS_BYTES_HEX       (1)