diff --git a/core/net/ip/resolv.c b/core/net/ip/resolv.c
index bc82dff17..deac38e6c 100644
--- a/core/net/ip/resolv.c
+++ b/core/net/ip/resolv.c
@@ -504,8 +504,6 @@ start_name_collision_check(clock_time_t after)
 static unsigned char *
 mdns_write_announce_records(unsigned char *queryptr, uint8_t *count)
 {
-  struct dns_answer *ans;
-
 #if NETSTACK_CONF_WITH_IPV6
   uint8_t i;
 
@@ -522,7 +520,6 @@ mdns_write_announce_records(unsigned char *queryptr, uint8_t *count)
         *queryptr++ = 0xc0;
         *queryptr++ = sizeof(struct dns_hdr);
       }
-      ans = (struct dns_answer *)queryptr;
 
       *queryptr++ = (uint8_t) ((NATIVE_DNS_TYPE) >> 8);
       *queryptr++ = (uint8_t) ((NATIVE_DNS_TYPE));
@@ -544,6 +541,8 @@ mdns_write_announce_records(unsigned char *queryptr, uint8_t *count)
     }
   }
 #else /* NETSTACK_CONF_WITH_IPV6 */
+  struct dns_answer *ans;
+
   queryptr = encode_name(queryptr, resolv_hostname);
   ans = (struct dns_answer *)queryptr;
   ans->type = UIP_HTONS(NATIVE_DNS_TYPE);
@@ -601,8 +600,6 @@ mdns_prep_host_announce_packet(void)
 
   uint8_t total_answers = 0;
 
-  struct dns_answer *ans;
-
   /* Be aware that, unless `ARCH_DOESNT_NEED_ALIGNED_STRUCTS` is set,
    * writing directly to the uint16_t members of this struct is an error. */
   struct dns_hdr *hdr = (struct dns_hdr *)uip_appdata;