diff --git a/lang/qt/src/qgpgmenewcryptoconfig.cpp b/lang/qt/src/qgpgmenewcryptoconfig.cpp
index d413126f..ba028a97 100644
--- a/lang/qt/src/qgpgmenewcryptoconfig.cpp
+++ b/lang/qt/src/qgpgmenewcryptoconfig.cpp
@@ -49,6 +49,7 @@
 
 #include <sstream>
 #include <string>
+#include <functional>
 #include <cassert>
 #include <functional>