diff --git a/include/exiv2/value.hpp b/include/exiv2/value.hpp
index c9c3830e80..7152cd6939 100644
--- a/include/exiv2/value.hpp
+++ b/include/exiv2/value.hpp
@@ -14,6 +14,7 @@
 #include <cstring>
 #include <iomanip>
 #include <map>
+#include <memory>
 
 // *****************************************************************************
 // namespace extensions