diff --git a/src/Project.h b/src/Project.h
index 328add092..e61044797 100644
--- a/src/Project.h
+++ b/src/Project.h
@@ -31,6 +31,7 @@
 #include "xml/XMLTagHandler.h"
 #include "toolbars/SelectionBarListener.h"
 #include "toolbars/SpectralSelectionBarListener.h"
+#include "widgets/Meter.h"
 
 #include <wx/defs.h>
 #include <wx/event.h>
diff --git a/src/toolbars/MeterToolBar.h b/src/toolbars/MeterToolBar.h
index a08e12a42..51bb4f2e8 100644
--- a/src/toolbars/MeterToolBar.h
+++ b/src/toolbars/MeterToolBar.h
@@ -15,6 +15,7 @@
 #define __AUDACITY_METER_TOOLBAR__
 
 #include "ToolBar.h"
+#include "../Project.h"
 
 class wxDC;
 class wxGridBagSizer;