diff --git a/ports/unix/variants/mpconfigvariant_common.h b/ports/unix/variants/mpconfigvariant_common.h
index cea039741..093477af0 100644
--- a/ports/unix/variants/mpconfigvariant_common.h
+++ b/ports/unix/variants/mpconfigvariant_common.h
@@ -121,3 +121,5 @@
 #define MICROPY_PY_MACHINE             (1)
 #define MICROPY_PY_MACHINE_PULSE       (1)
 #define MICROPY_PY_MACHINE_PIN_BASE    (1)
+
+#define MICROPY_VFS_ROM                (1)