1 files changed, 1 insertions, 0 deletions

diff --git a/framework/src/domain/mime/mimetreeparser/objecttreeparser.h b/framework/src/domain/mime/mimetreeparser/objecttreeparser.h
index aebdae7b..398cbcd7 100644
--- a/framework/src/domain/mime/mimetreeparser/objecttreeparser.h
+++ b/framework/src/domain/mime/mimetreeparser/objecttreeparser.h
@@ -38,6 +38,7 @@
 #include "messagepart.h"
 
 #include <gpgme++/verificationresult.h>
+#include <functional>
 
 class QString;