1 files changed, 3 insertions, 2 deletions
diff --git a/libs/midi++2/midi++/port.h b/libs/midi++2/midi++/port.h
index a915320fa3..9515bdb5a4 100644
--- a/libs/midi++2/midi++/port.h
+++ b/libs/midi++2/midi++/port.h
@@ -33,6 +33,7 @@
 #include "pbd/signals.h"
 #include "pbd/ringbuffer.h"
 
+#include "midi++/libmidi_visibility.h"
 #include "midi++/types.h"
 #include "midi++/parser.h"
 
@@ -41,7 +42,7 @@ namespace MIDI {
 class Channel;
 class PortRequest;
 
-class Port {
+class LIBMIDIPP_API Port {
   public:
 	enum Flags {
 		IsInput = JackPortIsInput,
@@ -140,7 +141,7 @@ class Port {
 	void init (std::string const &, Flags);
 };
 
-struct PortSet {
+struct LIBMIDIPP_API PortSet {
     PortSet (std::string str) : owner (str) { }
     
     std::string owner;