diff --git a/macosx/coremidi/JackCoreMidiOutputPort.mm b/macosx/coremidi/JackCoreMidiOutputPort.mm
index f62ebaff..e263af95 100644
--- a/macosx/coremidi/JackCoreMidiOutputPort.mm
+++ b/macosx/coremidi/JackCoreMidiOutputPort.mm
@@ -18,6 +18,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
 #include <cassert>
+#include <memory>
 #include <cerrno>
 #include <cstring>
 #include <new>