Refs #30887 include header for Peak class

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"