diff --git a/gtk2_ardour/editor_snapshots.cc b/gtk2_ardour/editor_snapshots.cc
index 65895f32d3..1047f256f7 100644
--- a/gtk2_ardour/editor_snapshots.cc
+++ b/gtk2_ardour/editor_snapshots.cc
@@ -20,7 +20,9 @@
 
 #include <glib.h>
 #include <glib/gstdio.h>
+
 #include <glibmm.h>
+#include <glibmm/datetime.h>
 
 #include <gtkmm/liststore.h>
 
diff --git a/gtk2_ardour/session_dialog.cc b/gtk2_ardour/session_dialog.cc
index c08328ba5d..2952377ac7 100644
--- a/gtk2_ardour/session_dialog.cc
+++ b/gtk2_ardour/session_dialog.cc
@@ -26,7 +26,9 @@
 
 #include <glib.h>
 #include <glib/gstdio.h>
+
 #include <glibmm.h>
+#include <glibmm/datetime.h>
 
 #include <gtkmm/filechooser.h>