diff --git a/crypto.hpp b/crypto.hpp
index 0d3adbe..3629598 100644
--- a/crypto.hpp
+++ b/crypto.hpp
@@ -4,6 +4,7 @@
 #include <cmath>
 #include <iomanip>
 #include <istream>
+#include <memory>
 #include <sstream>
 #include <string>
 #include <vector>