--- a/src/qtgui/recoll-win.pro
+++ b/src/qtgui/recoll-win.pro
@@ -27,6 +27,7 @@
         fragbuts.h \
         idxsched.h \
         widgets/listdialog.h \
+        widgets/qxtconfirmationmessage.h \
         preview_w.h \
         preview_load.h \
         preview_plaintorich.h \