header fix

kollanur · kollanur · commit e744704bd416 · 2026-04-27T17:03:38.000-05:00
Signed-off-by: Bharath &lt;bharath.kollanur@gmail.com&gt;
diff --git a/libs/core/execution/tests/unit/executor_parameters_partition_hooks.cpp b/libs/core/execution/tests/unit/executor_parameters_partition_hooks.cpp
@@ -10,6 +10,7 @@
 #include <hpx/init.hpp>
 #include <hpx/modules/testing.hpp>
 
+#include <cstddef>
 #include <cstdint>
 #include <functional>
 #include <numeric>
