diff --git a/examples/wifi/scan/main/scan.c b/examples/wifi/scan/main/scan.c
index f48464886..28c5a704f 100644
--- a/examples/wifi/scan/main/scan.c
+++ b/examples/wifi/scan/main/scan.c
@@ -9,12 +9,12 @@
 
 /*
    this example shows how to use all channel scan or fast scan to connect
-   In the fast scan mode, scan will end after find matched AP, in this mode, you 
-   can set the threshold of auth mode and signal, the filter will ignore the AP 
+   In the fast scan mode, scan will end after find matched AP, in this mode, you
+   can set the threshold of auth mode and signal, the filter will ignore the AP
    whose auth mode and rssi below the threshold.
-   In the all channel scan, scan will end after scan all the channel, and will 
+   In the all channel scan, scan will end after scan all the channel, and will
    the best AP to connect, you can sort by signal or auth mode, auth mode is follow
-   the rule WPA2>WPA>WEP. 
+   the rule WPA2>WPA>WEP.
 */
 #include "freertos/FreeRTOS.h"
 #include "freertos/event_groups.h"
@@ -65,22 +65,22 @@ static const char *TAG = "scan";
 
 static esp_err_t event_handler(void *ctx, system_event_t *event)
 {
-    switch(event->event_id) {
-    case SYSTEM_EVENT_STA_START:
-	ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
-	ESP_ERROR_CHECK(esp_wifi_connect());
-	break;
-    case SYSTEM_EVENT_STA_GOT_IP:
-	ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
-	ESP_LOGI(TAG, "got ip:%s\n",
-		ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
-        break;
-    case SYSTEM_EVENT_STA_DISCONNECTED:
-	ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
-	ESP_ERROR_CHECK(esp_wifi_connect());
-	break;
-    default:
-        break;
+    switch (event->event_id) {
+        case SYSTEM_EVENT_STA_START:
+            ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
+            ESP_ERROR_CHECK(esp_wifi_connect());
+            break;
+        case SYSTEM_EVENT_STA_GOT_IP:
+            ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
+            ESP_LOGI(TAG, "got ip:%s\n",
+                     ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
+            break;
+        case SYSTEM_EVENT_STA_DISCONNECTED:
+            ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
+            ESP_ERROR_CHECK(esp_wifi_connect());
+            break;
+        default:
+            break;
     }
     return ESP_OK;
 }
@@ -90,18 +90,18 @@ static void wifi_scan(void)
 {
     tcpip_adapter_init();
     ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));
-    
+
     wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
     ESP_ERROR_CHECK(esp_wifi_init(&cfg));
     wifi_config_t wifi_config = {
-	.sta = {
-	    .ssid = DEFAULT_SSID,
-	    .password = DEFAULT_PWD,
+        .sta = {
+            .ssid = DEFAULT_SSID,
+            .password = DEFAULT_PWD,
             .scan_method = DEFAULT_SCAN_METHOD,
             .sort_method = DEFAULT_SORT_METHOD,
             .threshold.rssi = DEFAULT_RSSI,
             .threshold.authmode = DEFAULT_AUTHMODE,
-	},
+        },
     };
     ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
     ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));