diff --git a/src/util/io.hpp b/src/util/io.hpp
index 6ca861f..c61dccf 100644
--- a/src/util/io.hpp
+++ b/src/util/io.hpp
@@ -16,6 +16,7 @@
 #include "../common.hpp"
 
 #include "../encoding/block.hpp"
+#include "../encoding/buffer-stream.hpp"
 
 #include <string>
 #include <iostream>