diff --git a/lib/base/namespace.hpp b/lib/base/namespace.hpp
index 21ebe929b..eb4928620 100644
--- a/lib/base/namespace.hpp
+++ b/lib/base/namespace.hpp
@@ -26,6 +26,7 @@
 #include "base/debuginfo.hpp"
 #include <map>
 #include <vector>
+#include <memory>
 
 namespace icinga
 {