diff --git a/ports/nrf/boards/p8/mpconfigboard.h b/ports/nrf/boards/p8/mpconfigboard.h
index adcc5af61..f828e36c2 100644
--- a/ports/nrf/boards/p8/mpconfigboard.h
+++ b/ports/nrf/boards/p8/mpconfigboard.h
@@ -68,6 +68,7 @@
 #define MICROPY_HW_PWM1_NAME        "PWM1"
 #define MICROPY_HW_PWM2_NAME        "PWM2"
 
+#define MICROPY_MBFS                (0)
 #define MICROPY_VFS                 (1)
 //MICROPY_VFS_LFS2 is defined via the command line to ensure the
 //library code gets built