diff --git a/libs/backends/jack/jack_session.cc b/libs/backends/jack/jack_session.cc
index 7cd7f6c62b..60d11a8f0c 100644
--- a/libs/backends/jack/jack_session.cc
+++ b/libs/backends/jack/jack_session.cc
@@ -25,6 +25,8 @@
 #include <jack/jack.h>
 #include <jack/transport.h>
 
+#include "pbd/localtime_r.h"
+
 #include "ardour/audioengine.h"
 #include "ardour/filename_extensions.h"
 #include "ardour/session.h"