diff --git a/gtk2_ardour/ardour_ui.cc b/gtk2_ardour/ardour_ui.cc
index ccb97bcf11..970e6cf1a0 100644
--- a/gtk2_ardour/ardour_ui.cc
+++ b/gtk2_ardour/ardour_ui.cc
@@ -144,6 +144,7 @@ typedef uint64_t microseconds_t;
 #include "open_file_dialog_proxy.h"
 #include "waves_message_dialog.h"
 #include "crash_recovery_dialog.h"
+#include "selection.h"
 
 using namespace ARDOUR;
 using namespace ARDOUR_UI_UTILS;
diff --git a/gtk2_ardour/ardour_ui.h b/gtk2_ardour/ardour_ui.h
index c0a2f2f2ca..d6d6cb3d05 100644
--- a/gtk2_ardour/ardour_ui.h
+++ b/gtk2_ardour/ardour_ui.h
@@ -97,8 +97,8 @@
 
 #include "timecode/time.h"
 #include "time.h"
-#include "selection.h"
 
+struct MarkerSelection;
 class VideoTimeLine;
 class ArdourKeyboard;
 class AudioClock;