1 files changed, 5 insertions, 3 deletions
diff --git a/src/google/protobuf/stubs/hash.h b/src/google/protobuf/stubs/hash.h
index badcb6a5..33b7b91a 100644
--- a/src/google/protobuf/stubs/hash.h
+++ b/src/google/protobuf/stubs/hash.h
@@ -168,12 +168,14 @@ struct hash<const char*> {
 };
 
 template <typename Key, typename Data, typename HashFcn = hash<Key>,
-          typename EqualKey = std::equal_to<Key> >
+          typename EqualKey = std::equal_to<Key>,
+          typename Alloc = std::allocator< std::pair<const Key, Data> > >
 class hash_map
     : public GOOGLE_PROTOBUF_HASH_NAMESPACE::GOOGLE_PROTOBUF_HASH_MAP_CLASS<
-          Key, Data, HashFcn, EqualKey> {
+          Key, Data, HashFcn, EqualKey, Alloc> {
  public:
-  hash_map(int = 0) {}
+  hash_map(int = 0, const HashFcn& = HashFcn(), const EqualKey& = EqualKey(),
+           const Alloc& = Alloc()) {}
 };
 
 template <typename Key, typename HashFcn = hash<Key>,