diff --git a/kleopatra/crypto/gui/newresultpage.cpp b/kleopatra/crypto/gui/newresultpage.cpp
index 96d1cb2..5c7281a 100644
--- a/kleopatra/crypto/gui/newresultpage.cpp
+++ b/kleopatra/crypto/gui/newresultpage.cpp
@@ -40,6 +40,7 @@
 #include <crypto/taskcollection.h>
 
 #include <utils/stl_util.h>
+#include <boost/mem_fn.hpp>
 
 #include <KLocalizedString>