diff --git a/qt/widgets/instrumentview/src/PeakMarker2D.cpp b/qt/widgets/instrumentview/src/PeakMarker2D.cpp
index 64f47cf0e0bf78c3ff02c4f8d1a76c9bb74f604c..f6bef556f50bcea5e5e2b0f5b14e9b2c0869ddf1 100644
--- a/qt/widgets/instrumentview/src/PeakMarker2D.cpp
+++ b/qt/widgets/instrumentview/src/PeakMarker2D.cpp
@@ -4,6 +4,7 @@
 //   NScD Oak Ridge National Laboratory, European Spallation Source,
 //   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
 // SPDX - License - Identifier: GPL - 3.0 +
+#include "MantidDataObjects/Peak.h"
 #include "MantidQtWidgets/InstrumentView/PeakMarker2D.h"
 #include "MantidQtWidgets/InstrumentView/PeakOverlay.h"