--- a/src/qtgui/preview_w.cpp
+++ b/src/qtgui/preview_w.cpp
@@ -51,6 +51,7 @@
 #include "recoll.h"
 #include "plaintorich.h"
 #include "smallut.h"
+#include "chrono.h"
 #include "wipedir.h"
 #include "cancelcheck.h"
 #include "preview_w.h"