diff --git a/ports/nrf/boards/dsd6/mpconfigboard.h b/ports/nrf/boards/dsd6/mpconfigboard.h
index 3c3131d1c..422d062cc 100644
--- a/ports/nrf/boards/dsd6/mpconfigboard.h
+++ b/ports/nrf/boards/dsd6/mpconfigboard.h
@@ -67,4 +67,10 @@
 #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
+
+
 #define HELP_TEXT_BOARD_LED         ""
diff --git a/ports/nrf/boards/nitrogen/mpconfigboard.h b/ports/nrf/boards/nitrogen/mpconfigboard.h
index 71d07426a..5921d2008 100644
--- a/ports/nrf/boards/nitrogen/mpconfigboard.h
+++ b/ports/nrf/boards/nitrogen/mpconfigboard.h
@@ -72,4 +72,9 @@
 #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
+
 #define HELP_TEXT_BOARD_LED         "1,2"
diff --git a/ports/nrf/boards/nrf52832_512k_64k_bldr78.ld b/ports/nrf/boards/nrf52832_512k_64k_bldr78.ld
index 998c58629..c4da6c4b0 100644
--- a/ports/nrf/boards/nrf52832_512k_64k_bldr78.ld
+++ b/ports/nrf/boards/nrf52832_512k_64k_bldr78.ld
@@ -4,6 +4,7 @@
 
 _flash_size = 0x78000; /* bootloader starts at 0x78000 */
 _ram_size   = 64K;
+_fs_size    = 0;
 
 /* produce a link error if there is not this amount of RAM for these sections */
 _stack_size = 8K;
diff --git a/ports/nrf/boards/pinetime/mpconfigboard.h b/ports/nrf/boards/pinetime/mpconfigboard.h
index baeaeaf1f..aa3c89d0b 100644
--- a/ports/nrf/boards/pinetime/mpconfigboard.h
+++ b/ports/nrf/boards/pinetime/mpconfigboard.h
@@ -69,6 +69,7 @@
 #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