diff --git a/wpiutil/src/main/native/include/wpi/util/Handle.hpp b/wpiutil/src/main/native/include/wpi/util/Handle.hpp
index ea35add438..10c4c4f4b3 100644
--- a/wpiutil/src/main/native/include/wpi/util/Handle.hpp
+++ b/wpiutil/src/main/native/include/wpi/util/Handle.hpp
@@ -7,6 +7,7 @@
 #include <stdint.h>
 
 #include <concepts>
+#include <cstddef>
 
 #include "wpi/util/Handle.h"