diff --git a/Common/include/Luau/DenseHash.h b/Common/include/Luau/DenseHash.h
index fe12ebc6..8f1fc8b7 100644
--- a/Common/include/Luau/DenseHash.h
+++ b/Common/include/Luau/DenseHash.h
@@ -3,6 +3,7 @@
 
 #include "Luau/Common.h"
 
+#include <cstddef>
 #include <functional>
 #include <utility>
 #include <type_traits>