diff --git a/include/stdplus/str/buf.hpp b/include/stdplus/str/buf.hpp
index 1870619..eed6314 100644
--- a/include/stdplus/str/buf.hpp
+++ b/include/stdplus/str/buf.hpp
@@ -1,4 +1,6 @@
 #pragma once
+
+#include <bit>
 #include <cstdint>
 #include <limits>
 #include <memory>