diff --git a/src/dns_server.c b/src/dns_server.c
index 56a75dc..17ad7fb 100644
--- a/src/dns_server.c
+++ b/src/dns_server.c
@@ -304,7 +304,6 @@ static int _dns_reply(struct dns_request *request)
 
 int _dns_server_request_complete(struct dns_request *request)
 {
-	int ret = -1;
 	char *cname = NULL;
 	int cname_ttl = 0;
 
diff --git a/src/include/art.h b/src/include/art.h
index d4e4555..e327b00 100644
--- a/src/include/art.h
+++ b/src/include/art.h
@@ -106,7 +106,7 @@ typedef struct {
 typedef struct {
     void *value;
     uint32_t key_len;
-    unsigned char key[];
+    unsigned char key[0];
 } art_leaf;
 
 /**