diff --git a/main/include/app_config.h b/main/include/app_config.h
index cba28c97..22820c1a 100644
--- a/main/include/app_config.h
+++ b/main/include/app_config.h
@@ -42,8 +42,8 @@
 #define NRF_SDH_BLE_PERIPHERAL_LINK_COUNT 1
 #define NRF_SDH_BLE_VS_UUID_COUNT 2
 #define NRF_BLE_GATT_ENABLED 1
-#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 251
-#define NRF_SDH_BLE_GAP_DATA_LENGTH 251
+#define NRF_SDH_BLE_GATT_MAX_MTU_SIZE 247
+#define NRF_SDH_BLE_GAP_DATA_LENGTH 247
 
 // ----- FDS / Flash Config -----