diff --git a/contrib/epee/include/span.h b/contrib/epee/include/span.h
index 19720ea8b..e100452ca 100644
--- a/contrib/epee/include/span.h
+++ b/contrib/epee/include/span.h
@@ -31,6 +31,7 @@
 #include <algorithm>
 #include <cstdint>
 #include <memory>
+#include <string>
 #include <type_traits>
 
 namespace epee