diff --git a/src/core/netif.c b/src/core/netif.c
index b771f348..bd63e58f 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -383,7 +383,7 @@ netif_remove(struct netif *netif)
  * in ascii representation (e.g. 'en0')
  */
 struct netif *
-netif_find(char *name)
+netif_find(const char *name)
 {
   struct netif *netif;
   u8_t num;
diff --git a/src/include/lwip/netif.h b/src/include/lwip/netif.h
index 2aea2c2a..09ad65f0 100644
--- a/src/include/lwip/netif.h
+++ b/src/include/lwip/netif.h
@@ -334,7 +334,7 @@ void netif_remove(struct netif * netif);
    "et0", where the first two letters are the "name" field in the
    netif structure, and the digit is in the num field in the same
    structure. */
-struct netif *netif_find(char *name);
+struct netif *netif_find(const char *name);
 
 void netif_set_default(struct netif *netif);