diff --git a/libs/canvas/wave_view.cc b/libs/canvas/wave_view.cc
index 8570d8d32c..c0496ef0c1 100644
--- a/libs/canvas/wave_view.cc
+++ b/libs/canvas/wave_view.cc
@@ -38,7 +38,7 @@
 
 #include <gdkmm/general.h>
 
-#include "gtk2_ardour/gui_thread.h"
+#include "gtkmm2ext/gui_thread.h"
 
 using namespace std;
 using namespace ARDOUR;