diff --git a/examples/bluetooth/ble_get_started/nimble/NimBLE_Beacon/README.md b/examples/bluetooth/ble_get_started/nimble/NimBLE_Beacon/README.md
index f619b8dd14..12aa5d9a93 100644
--- a/examples/bluetooth/ble_get_started/nimble/NimBLE_Beacon/README.md
+++ b/examples/bluetooth/ble_get_started/nimble/NimBLE_Beacon/README.md
@@ -85,7 +85,7 @@ void app_main(void) {
 }
 ```
 
-Then, call `nimble_port_init` function to initialize NimBLE host stack. 
+Then, call `nimble_port_init` function to initialize NimBLE host stack.
 
 ``` C
 void app_main(void) {
@@ -186,7 +186,7 @@ void app_main(void) {
 
     /* Start NimBLE host task thread and return */
     xTaskCreate(nimble_host_task, "NimBLE Host", 4*1024, NULL, 5, NULL);
-    return;   
+    return;
 }
 ```
 
@@ -205,7 +205,7 @@ static void on_stack_sync(void) {
 void adv_init(void) {
     /* Local variables */
     int rc = 0;
-    char addr_str[12] = {0};
+    char addr_str[18] = {0};
 
     /* Make sure we have proper BT identity address set */
     rc = ble_hs_util_ensure_addr(0);
diff --git a/examples/bluetooth/ble_get_started/nimble/NimBLE_GATT_Server/main/src/gap.c b/examples/bluetooth/ble_get_started/nimble/NimBLE_GATT_Server/main/src/gap.c
index 2d59d0224b..8519028a5d 100644
--- a/examples/bluetooth/ble_get_started/nimble/NimBLE_GATT_Server/main/src/gap.c
+++ b/examples/bluetooth/ble_get_started/nimble/NimBLE_GATT_Server/main/src/gap.c
@@ -259,7 +259,7 @@ static int gap_event_handler(struct ble_gap_event *event, void *arg) {
 void adv_init(void) {
     /* Local variables */
     int rc = 0;
-    char addr_str[12] = {0};
+    char addr_str[18] = {0};
 
     /* Make sure we have proper BT identity address set (random preferred) */
     rc = ble_hs_util_ensure_addr(0);
diff --git a/examples/bluetooth/ble_get_started/nimble/NimBLE_Security/main/src/gap.c b/examples/bluetooth/ble_get_started/nimble/NimBLE_Security/main/src/gap.c
index 64ec81dffd..d4e7c249b6 100644
--- a/examples/bluetooth/ble_get_started/nimble/NimBLE_Security/main/src/gap.c
+++ b/examples/bluetooth/ble_get_started/nimble/NimBLE_Security/main/src/gap.c
@@ -322,7 +322,7 @@ static int gap_event_handler(struct ble_gap_event *event, void *arg) {
 void adv_init(void) {
     /* Local variables */
     int rc = 0;
-    char addr_str[12] = {0};
+    char addr_str[18] = {0};
 
     /* Make sure we have proper BT identity address set */
     set_random_addr();