diff --git a/src/backend.hpp b/src/backend.hpp
index d534ec9..99f07d7 100644
--- a/src/backend.hpp
+++ b/src/backend.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include <cstddef>
+#include <cstdint>
 #include <functional>
 #include <string>
 #include <vector>