diff --git a/components/bt/esp_ble_mesh/mesh_core/crypto.h b/components/bt/esp_ble_mesh/mesh_core/crypto.h
index e8b3450728..f07ce2e638 100644
--- a/components/bt/esp_ble_mesh/mesh_core/crypto.h
+++ b/components/bt/esp_ble_mesh/mesh_core/crypto.h
@@ -77,7 +77,7 @@ static inline int bt_mesh_beacon_key(const uint8_t net_key[16],
 }
 
 int bt_mesh_beacon_auth(const uint8_t beacon_key[16], uint8_t flags,
-                        const uint8_t net_id[16], uint32_t iv_index,
+                        const uint8_t net_id[8], uint32_t iv_index,
                         uint8_t auth[8]);
 
 static inline int bt_mesh_app_id(const uint8_t app_key[16], uint8_t app_id[1])