diff --git a/gtk2_ardour/ardour_ui.cc b/gtk2_ardour/ardour_ui.cc
index 0f7ccebab7..db3dc5cb7c 100644
--- a/gtk2_ardour/ardour_ui.cc
+++ b/gtk2_ardour/ardour_ui.cc
@@ -52,6 +52,7 @@
 #include "pbd/memento_command.h"
 #include "pbd/openuri.h"
 #include "pbd/file_utils.h"
+#include "pbd/localtime_r.h"
 
 #include "gtkmm2ext/application.h"
 #include "gtkmm2ext/bindings.h"