diff --git a/src/core/netif.c b/src/core/netif.c
index d998288f..787e018e 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -1302,14 +1302,14 @@ netif_name_to_index(const char *name)
 * @param name char buffer of at least IF_NAMESIZE bytes
 */
 char *
-netif_index_to_name(u8_t index, char *name)
+netif_index_to_name(u8_t idx, char *name)
 {
   struct netif *curif = netif_list;
   u8_t num;
-  if (index == 0) {
+  if (idx == 0) {
     return NULL; /* indexes start at 1 */
   }
-  num = netif_index_to_num(index);
+  num = netif_index_to_num(idx);
 
   /* find netif from num */
   while (curif != NULL) {
diff --git a/src/include/lwip/netif.h b/src/include/lwip/netif.h
index 6fd20a36..abd4e440 100644
--- a/src/include/lwip/netif.h
+++ b/src/include/lwip/netif.h
@@ -492,7 +492,7 @@ err_t netif_add_ip6_address(struct netif *netif, const ip6_addr_t *ip6addr, s8_t
 
 /* @ingroup netif */
 u8_t netif_name_to_index(const char *name);
-char * netif_index_to_name(u8_t index, char *name);
+char * netif_index_to_name(u8_t idx, char *name);
 
 /* Interface indexes always start at 1 per RFC 3493, section 4, num starts at 0 */
 #define netif_num_to_index(netif)   ((netif)->num + 1)