diff --git a/thirdparty/lru_ordered_memory_constrained_cache.hpp b/thirdparty/lru_ordered_memory_constrained_cache.hpp
index 71908613..e10fffbc 100644
--- a/thirdparty/lru_ordered_memory_constrained_cache.hpp
+++ b/thirdparty/lru_ordered_memory_constrained_cache.hpp
@@ -17,6 +17,7 @@
 #include <stdexcept>
 #include <any>
 #include <memory>
+#include <shared_mutex>
 
 #define CACHE_READ_LOCK( _M_ ) std::shared_lock< std::shared_mutex > _read_lock_( _M_ );
 #define CACHE_WRITE_LOCK( _M_ ) std::unique_lock< std::shared_mutex > _write_lock_( _M_ );