diff --git a/examples/qtconcurrent/primecounter/primecounter.h b/examples/qtconcurrent/primecounter/primecounter.h
index 5b6d442cc8c..030d4464466 100644
--- a/examples/qtconcurrent/primecounter/primecounter.h
+++ b/examples/qtconcurrent/primecounter/primecounter.h
@@ -6,6 +6,7 @@
 
 #include <QtWidgets/qdialog.h>
 #include <QtCore/qfuturewatcher.h>
+#include <QtCore/qelapsedtimer.h>
 #include <QtConcurrent/qtconcurrentfilter.h>
 #include <QtConcurrent/qtconcurrentreducekernel.h>