diff --git a/src/net/AllocatedSocketAddress.hxx b/src/net/AllocatedSocketAddress.hxx
index 1301a06d1..8e9393145 100644
--- a/src/net/AllocatedSocketAddress.hxx
+++ b/src/net/AllocatedSocketAddress.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2012-2020 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -39,6 +39,7 @@
 #include <stdlib.h>
 
 struct sockaddr;
+struct StringView;
 
 class AllocatedSocketAddress {
 public: