diff --git a/src/NimBLEClient.cpp b/src/NimBLEClient.cpp
index a83e23b..f6d65b7 100644
--- a/src/NimBLEClient.cpp
+++ b/src/NimBLEClient.cpp
@@ -1140,6 +1140,7 @@ int NimBLEClient::handleGapEvent(struct ble_gap_event *event, void *arg) {
 
         case BLE_GAP_EVENT_PASSKEY_ACTION: {
             struct ble_sm_io pkey = {0,0};
+            (void)pkey; //warning: variable 'pkey' set but not used [-Wunused-but-set-variable]
 
             if(client->m_conn_id != event->passkey.conn_handle)
                 return 0;
diff --git a/src/NimBLEDevice.cpp b/src/NimBLEDevice.cpp
index 924fc6f..e19aa15 100644
--- a/src/NimBLEDevice.cpp
+++ b/src/NimBLEDevice.cpp
@@ -86,8 +86,10 @@ std::vector<NimBLEAddress>  NimBLEDevice::m_whiteList;
 NimBLESecurityCallbacks*    NimBLEDevice::m_securityCallbacks = nullptr;
 uint8_t                     NimBLEDevice::m_own_addr_type = BLE_OWN_ADDR_PUBLIC;
 #ifdef ESP_PLATFORM
+#  ifdef CONFIG_BTDM_BLE_SCAN_DUPL
 uint16_t                    NimBLEDevice::m_scanDuplicateSize = CONFIG_BTDM_SCAN_DUPL_CACHE_SIZE;
 uint8_t                     NimBLEDevice::m_scanFilterMode = CONFIG_BTDM_SCAN_DUPL_TYPE;
+#  endif
 #endif
 
 /**
@@ -493,6 +495,7 @@ uint16_t NimBLEDevice::getMTU() {
 
 
 #ifdef ESP_PLATFORM
+#  ifdef CONFIG_BTDM_BLE_SCAN_DUPL
 /**
  * @brief Set the duplicate filter cache size for filtering scanned devices.
  * @param [in] cacheSize The number of advertisements filtered before the cache is reset.\n
@@ -513,6 +516,7 @@ void NimBLEDevice::setScanDuplicateCacheSize(uint16_t cacheSize) {
 }
 
 
+
 /**
  * @brief Set the duplicate filter mode for filtering scanned devices.
  * @param [in] mode One of three possible options:
@@ -538,7 +542,8 @@ void NimBLEDevice::setScanFilterMode(uint8_t mode) {
 
     m_scanFilterMode = mode;
 }
-#endif
+#  endif // CONFIG_BTDM_BLE_SCAN_DUPL
+#endif   // ESP_PLATFORM
 
 #if defined(CONFIG_BT_NIMBLE_ROLE_CENTRAL) || defined(CONFIG_BT_NIMBLE_ROLE_PERIPHERAL)
 /**
@@ -868,19 +873,21 @@ void NimBLEDevice::init(const std::string &deviceName) {
 
 #if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 0, 0)
         esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
-#if  defined (CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S3)
+#  if  defined (CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S3)
         bt_cfg.bluetooth_mode = ESP_BT_MODE_BLE;
-#else
+#  else
         bt_cfg.mode = ESP_BT_MODE_BLE;
         bt_cfg.ble_max_conn = CONFIG_BT_NIMBLE_MAX_CONNECTIONS;
-#endif
+#  endif
+
+#  ifdef CONFIG_BTDM_BLE_SCAN_DUPL
         bt_cfg.normal_adv_size = m_scanDuplicateSize;
         bt_cfg.scan_duplicate_type = m_scanFilterMode;
-
+#  endif
         ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));
         ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));
         ESP_ERROR_CHECK(esp_nimble_hci_init());
-#endif
+#  endif
 #endif
         nimble_port_init();
 
diff --git a/src/NimBLEDevice.h b/src/NimBLEDevice.h
index 8d4d849..c73de22 100644
--- a/src/NimBLEDevice.h
+++ b/src/NimBLEDevice.h
@@ -230,8 +230,10 @@ private:
     static gap_event_handler          m_customGapHandler;
     static uint8_t                    m_own_addr_type;
 #ifdef ESP_PLATFORM
+#  ifdef CONFIG_BTDM_BLE_SCAN_DUPL
     static uint16_t                   m_scanDuplicateSize;
     static uint8_t                    m_scanFilterMode;
+#  endif
 #endif
     static std::vector<NimBLEAddress> m_whiteList;
 };