diff --git a/ports/samd/mpconfigport.h b/ports/samd/mpconfigport.h
index 801408ed47..91a7c1a10d 100644
--- a/ports/samd/mpconfigport.h
+++ b/ports/samd/mpconfigport.h
@@ -56,6 +56,7 @@
 #define MICROPY_PY_BUILTINS_HELP            (1)
 #define MICROPY_PY_BUILTINS_HELP_TEXT       samd_help_text
 #define MICROPY_PY_BUILTINS_HELP_MODULES    (1)
+#define MICROPY_USE_INTERNAL_ERRNO          (1)
 #define MICROPY_ENABLE_SCHEDULER            (1)
 #define MICROPY_SCHEDULER_STATIC_NODES      (1)
 #define MICROPY_HW_ENABLE_USBDEV            (1)