diff --git a/src/System/LRUCache.hpp b/src/System/LRUCache.hpp
index 1c24490..a04cdfa 100644
--- a/src/System/LRUCache.hpp
+++ b/src/System/LRUCache.hpp
@@ -18,6 +18,7 @@
 #include "System/Debug.hpp"
 
 #include <cstddef>
+#include <cstdint>
 #include <functional>
 #include <unordered_set>
 #include <vector>