diff --git a/src/crypto/common/Algorithm.h b/src/crypto/common/Algorithm.h
index 23c8e64..9cc3a80 100644
--- a/src/crypto/common/Algorithm.h
+++ b/src/crypto/common/Algorithm.h
@@ -21,6 +21,7 @@
 #define XMRIG_ALGORITHM_H
 
 
+#include <cstddef>
 #include <cstdint>
 #include <vector>