diff --git a/pkg/lwip/contrib/lwip.c b/pkg/lwip/contrib/lwip.c
index 619013f2c3..247ce10dab 100644
--- a/pkg/lwip/contrib/lwip.c
+++ b/pkg/lwip/contrib/lwip.c
@@ -97,7 +97,7 @@ static socket_zep_t socket_zep_devs[LWIP_NETIF_NUMOF];
 
 #ifdef MODULE_ESP_WIFI
 extern esp_wifi_netdev_t _esp_wifi_dev;
-extern void esp_wifi_setup (esp_wifi_netdev_t* dev);
+extern void esp_wifi_setup(esp_wifi_netdev_t *dev);
 #endif
 
 #ifdef MODULE_STM32_ETH