diff --git a/src/core/stats.c b/src/core/stats.c
index e218d692..66f5c88d 100644
--- a/src/core/stats.c
+++ b/src/core/stats.c
@@ -113,9 +113,9 @@ stats_display_mem(struct stats_mem *mem, const char *name)
 
 #if MEMP_STATS
 void
-stats_display_memp(struct stats_mem *mem, int index)
+stats_display_memp(struct stats_mem *mem, int idx)
 {
-  if (index < MEMP_MAX) {
+  if (idx < MEMP_MAX) {
     stats_display_mem(mem, mem->name);
   }
 }
diff --git a/src/include/netif/lowpan6.h b/src/include/netif/lowpan6.h
index 4174644b..7020e0dc 100644
--- a/src/include/netif/lowpan6.h
+++ b/src/include/netif/lowpan6.h
@@ -60,7 +60,7 @@ extern "C" {
 
 void lowpan6_tmr(void);
 
-err_t lowpan6_set_context(u8_t index, const ip6_addr_t * context);
+err_t lowpan6_set_context(u8_t idx, const ip6_addr_t * context);
 err_t lowpan6_set_short_addr(u8_t addr_high, u8_t addr_low);
 
 #if LWIP_IPV4