diff --git a/gtk2_ardour/ardour_button.cc b/gtk2_ardour/ardour_button.cc
index 805fdc82ae..fdff57c8aa 100644
--- a/gtk2_ardour/ardour_button.cc
+++ b/gtk2_ardour/ardour_button.cc
@@ -22,6 +22,7 @@
 #include <algorithm>
 
 #include <pangomm/layout.h>
+#include "gtkmm/style.h"
 
 #include "pbd/compose.h"
 #include "pbd/error.h"