diff --git a/NumLib/TimeStepping/TimeInterval.h b/NumLib/TimeStepping/TimeInterval.h
index 16f9992b787580e3875e4ef3eca5159e1005bf85..f873b1f49ded1b9488f5fd16bd746119e472d41a 100644
--- a/NumLib/TimeStepping/TimeInterval.h
+++ b/NumLib/TimeStepping/TimeInterval.h
@@ -12,6 +12,8 @@
  */
 #pragma once
 
+#include <memory>
+
 namespace BaseLib
 {
 class ConfigTree;