diff --git a/urbackupserver/WalCheckpointThread.h b/urbackupserver/WalCheckpointThread.h
index edd9d954..635375f4 100644
--- a/urbackupserver/WalCheckpointThread.h
+++ b/urbackupserver/WalCheckpointThread.h
@@ -4,6 +4,7 @@
 #include "../Interface/Mutex.h"
 #include "../Interface/Condition.h"
 #include <set>
+#include <memory>
 
 class IFile;