diff --git a/serializer.hh b/serializer.hh
index 47b734019a..5bd0fb75f3 100644
--- a/serializer.hh
+++ b/serializer.hh
@@ -26,6 +26,7 @@
 #include <unordered_map>
 #include <experimental/optional>
 #include "enum_set.hh"
+#include "utils/managed_bytes.hh"
 #include "bytes_ostream.hh"
 #include "core/simple-stream.hh"
 #include "boost/variant/variant.hpp"