diff --git a/main/eth.c b/main/eth.c
index f5daaf3..c0ed1d5 100644
--- a/main/eth.c
+++ b/main/eth.c
@@ -16,7 +16,9 @@ static const char *TAG = "Ethernet";
 static eth_on_connected_cb_t on_connected_cb = NULL;
 static eth_on_disconnected_cb_t on_disconnected_cb = NULL;
 static char *eth_hostname = NULL;
+#if CONFIG_ETH_USE_ESP32_EMAC
 static esp_netif_t *eth_netif = NULL;
+#endif
 
 void eth_set_on_connected_cb(eth_on_connected_cb_t cb)
 {
diff --git a/sdkconfig.defaults.esp32c3 b/sdkconfig.defaults.esp32c3
new file mode 100644
index 0000000..e45a242
--- /dev/null
+++ b/sdkconfig.defaults.esp32c3
@@ -0,0 +1,4 @@
+# This file was generated using idf.py save-defconfig. It can be edited manually.
+# Espressif IoT Development Framework (ESP-IDF) Project Minimal Configuration
+#
+CONFIG_BT_BLE_42_FEATURES_SUPPORTED=y
diff --git a/sdkconfig.defaults.esp32s3 b/sdkconfig.defaults.esp32s3
new file mode 100644
index 0000000..e45a242
--- /dev/null
+++ b/sdkconfig.defaults.esp32s3
@@ -0,0 +1,4 @@
+# This file was generated using idf.py save-defconfig. It can be edited manually.
+# Espressif IoT Development Framework (ESP-IDF) Project Minimal Configuration
+#
+CONFIG_BT_BLE_42_FEATURES_SUPPORTED=y