diff --git a/unix/modos.c b/unix/modos.c
index 1fd8790a30b7eb04495804db1a28289a4209f76b..e50c3aa16639b1635aa0998b5164628cb6c29975 100644
--- a/unix/modos.c
+++ b/unix/modos.c
@@ -30,6 +30,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <stdlib.h>
+#include "py/mpconfig.h"
 #if MICROPY_PY_OS_STATVFS
 #include <sys/statvfs.h>
 #endif