diff --git a/lib/inc/drogon/utils/Utilities.h b/lib/inc/drogon/utils/Utilities.h
index ea066d84..ac58007f 100755
--- a/lib/inc/drogon/utils/Utilities.h
+++ b/lib/inc/drogon/utils/Utilities.h
@@ -18,6 +18,7 @@
 #include <trantor/utils/Date.h>
 #include <string>
 #include <vector>
+#include <memory>
 
 namespace drogon
 {