diff --git a/ports/stm32/sdram.c b/ports/stm32/sdram.c
index e8892b5746..2791df277a 100644
--- a/ports/stm32/sdram.c
+++ b/ports/stm32/sdram.c
@@ -73,7 +73,9 @@ bool sdram_init(void) {
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNRAS, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNRAS);
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_SDNWE, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_SDNWE);
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_BA0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_BA0);
+    #ifdef MICROPY_HW_FMC_BA1
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_BA1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_BA1);
+    #endif
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_NBL0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_NBL0);
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_NBL1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_NBL1);
     #ifdef MICROPY_HW_FMC_NBL2
@@ -91,7 +93,9 @@ bool sdram_init(void) {
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A8, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A8);
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A9, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A9);
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A10, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A10);
+    #ifdef MICROPY_HW_FMC_A11
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A11, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A11);
+    #endif
     #ifdef MICROPY_HW_FMC_A12
     mp_hal_pin_config_alt_static_speed(MICROPY_HW_FMC_A12, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, MP_HAL_PIN_SPEED_VERY_HIGH, STATIC_AF_FMC_A12);
     #endif