diff --git a/ports/unix/mpconfigport.h b/ports/unix/mpconfigport.h
index c74d2fd84..17f489557 100644
--- a/ports/unix/mpconfigport.h
+++ b/ports/unix/mpconfigport.h
@@ -87,6 +87,7 @@
 #define MICROPY_VFS_POSIX_FILE      (1)
 #define MICROPY_PY_FUNCTION_ATTRS   (1)
 #define MICROPY_PY_DESCRIPTORS      (1)
+#define MICROPY_PY_DELATTR_SETATTR  (1)
 #define MICROPY_PY_BUILTINS_STR_UNICODE (1)
 #define MICROPY_PY_BUILTINS_STR_CENTER (1)
 #define MICROPY_PY_BUILTINS_STR_PARTITION (1)