diff --git a/backend/src/cryptography.hpp b/backend/src/cryptography.hpp
index dd0dfe9..32a6f1d 100644
--- a/backend/src/cryptography.hpp
+++ b/backend/src/cryptography.hpp
@@ -1,5 +1,6 @@
 #include <vector>
 #include <string>
+#include <cstring>
 #include <unordered_set>
 
 #ifndef CRYPTOGRAPHY_H