diff --git a/src/crypto/common/Algorithm.h b/src/crypto/common/Algorithm.h
index 23c8e64..b4909de 100644
--- a/src/crypto/common/Algorithm.h
+++ b/src/crypto/common/Algorithm.h
@@ -22,6 +22,7 @@
 
 
 #include <cstdint>
+#include <cstddef>
 #include <vector>