diff --git a/lib/remote/pkiutility.hpp b/lib/remote/pkiutility.hpp
index 500b7be69..f73448b8f 100644
--- a/lib/remote/pkiutility.hpp
+++ b/lib/remote/pkiutility.hpp
@@ -24,6 +24,7 @@
 #include "base/dictionary.hpp"
 #include "base/string.hpp"
 #include <openssl/x509v3.h>
+#include <memory>
 
 namespace icinga
 {