diff --git a/unix/mpconfigport.h b/unix/mpconfigport.h
index 014272e7ae..891ba82e5e 100644
--- a/unix/mpconfigport.h
+++ b/unix/mpconfigport.h
@@ -76,6 +76,9 @@
 #define MICROPY_PY_IO_FILEIO        (1)
 #define MICROPY_PY_GC_COLLECT_RETVAL (1)
 
+#define MICROPY_STACKLESS           (0)
+#define MICROPY_STACKLESS_STRICT    (0)
+
 #define MICROPY_PY_UCTYPES          (1)
 #define MICROPY_PY_UZLIB            (1)
 #define MICROPY_PY_UJSON            (1)