diff --git a/libs/midi++2/SConscript b/libs/midi++2/SConscript
index e9fbc0abf5..04b027b6a3 100644
--- a/libs/midi++2/SConscript
+++ b/libs/midi++2/SConscript
@@ -7,7 +7,7 @@ import glob
 Import('env libraries install_prefix')
 
 midi2 = env.Copy()
-midi2.Merge([ libraries['sigc2'], libraries['xml'], libraries['glib2'], libraries['pbd'] ])
+midi2.Merge([ libraries['sigc2'], libraries['xml'], libraries['glib2'], libraries['pbd'], libraries['jack'] ])
 
 domain = 'midipp'