diff --git a/src/math/bigfix/u256.cpp b/src/math/bigfix/u256.cpp
index 6b956b844..d052a2583 100644
--- a/src/math/bigfix/u256.cpp
+++ b/src/math/bigfix/u256.cpp
@@ -1,5 +1,6 @@
 #include "math/bigfix/u256.h"
 #include "math/bigfix/Hacl_Bignum256.h"
+#include <memory>
 
 u256::u256(uint64_t n) {
     m_num[0] = n;