1 files changed, 1 insertions, 1 deletions
diff --git a/libs/ardour/ardour/midi_operator.h b/libs/ardour/ardour/midi_operator.h
index c5def76384..00678a2831 100644
--- a/libs/ardour/ardour/midi_operator.h
+++ b/libs/ardour/ardour/midi_operator.h
@@ -32,7 +32,7 @@ namespace ARDOUR {
 
 class MidiModel;
 
-class MidiOperator {
+class LIBARDOUR_API MidiOperator {
   public:
 	MidiOperator () {}
 	virtual ~MidiOperator() {}