diff --git a/src/backend/common/benchmark/BenchState.h b/src/backend/common/benchmark/BenchState.h
index 4f65ac177..035d12338 100644
--- a/src/backend/common/benchmark/BenchState.h
+++ b/src/backend/common/benchmark/BenchState.h
@@ -20,6 +20,7 @@
 #define XMRIG_BENCHSTATE_H
 
 
+#include <cstddef>
 #include <cstdint>