diff --git a/inc/core/MicroBitConfig.h b/inc/core/MicroBitConfig.h
index e6df68c..0ece583 100644
--- a/inc/core/MicroBitConfig.h
+++ b/inc/core/MicroBitConfig.h
@@ -49,13 +49,21 @@ DEALINGS IN THE SOFTWARE.
 
 // The end address of memory normally reserved for Soft Device.
 #ifndef MICROBIT_SD_LIMIT
+#ifdef TARGET_MCU_NRF51_16K_S130
+#define MICROBIT_SD_LIMIT                       0x20002800
+#else
 #define MICROBIT_SD_LIMIT                       0x20002000
 #endif
+#endif
 
 // The physical address in memory of the Soft Device GATT table.
 #ifndef MICROBIT_SD_GATT_TABLE_START
+#ifdef TARGET_MCU_NRF51_16K_S130
+#define MICROBIT_SD_GATT_TABLE_START            0x20002200
+#else
 #define MICROBIT_SD_GATT_TABLE_START            0x20001900
 #endif
+#endif
 
 // Physical address of the top of the system stack (on mbed-classic this is the top of SRAM)
 #ifndef CORTEX_M0_STACK_BASE