diff --git a/mdns.c b/mdns.c
index ed7d77fa..53b5df76 100644
--- a/mdns.c
+++ b/mdns.c
@@ -61,7 +61,7 @@ static mdns_backend *mdns_backends[] = {
 };
 
 void mdns_register(void) {
-    char *mdns_apname = malloc(strlen(config.apname) + 14);
+    char *mdns_apname = alloca(strlen(config.apname) + 14);
     char *p = mdns_apname;
     int i;
     for (i=0; i<6; i++) {