diff --git a/lang/qt/src/util.cpp b/lang/qt/src/util.cpp
index 9487b7b3..3d10e2fe 100644
--- a/lang/qt/src/util.cpp
+++ b/lang/qt/src/util.cpp
@@ -34,6 +34,7 @@
 #include "util.h"
 
 #include <QStringList>
+#include <functional>
 
 std::vector<std::string> toStrings(const QStringList &l)
 {