diff --git a/libs/ardour/ardour/msvc_libardour.h b/libs/ardour/ardour/msvc_libardour.h
index 75c932905e..52aa65d95c 100644
--- a/libs/ardour/ardour/msvc_libardour.h
+++ b/libs/ardour/ardour/msvc_libardour.h
@@ -19,37 +19,9 @@
 #ifndef __msvc_libardour_h__
 #define __msvc_libardour_h__
 
+#include "ardour/visibility.h"
 #include <limits.h>
 
-#ifdef  LIBARDOUR_IS_IN_WIN_STATIC_LIB  // #define if your project uses libardour (under Windows) as a static library
-#define LIBARDOUR_IS_IN_WINDLL 0
-#endif
-
-#if !defined(LIBARDOUR_IS_IN_WINDLL)
-	#if defined(COMPILER_MSVC) || defined(COMPILER_MINGW)
-	// If you need '__declspec' compatibility, add extra compilers to the above as necessary
-		#define LIBARDOUR_IS_IN_WINDLL 1
-	#else
-		#define LIBARDOUR_IS_IN_WINDLL 0
-	#endif
-#endif
-
-#if LIBARDOUR_IS_IN_WINDLL && !defined(LIBARDOUR_API)
-	#if defined(BUILDING_LIBARDOUR)
-		#define LIBARDOUR_API __declspec(dllexport)
-		#define LIBARDOUR_APICALLTYPE __stdcall
-	#elif defined(COMPILER_MSVC) || defined(COMPILER_MINGW) // Probably needs Cygwin too, at some point
-		#define LIBARDOUR_API __declspec(dllimport)
-		#define LIBARDOUR_APICALLTYPE __stdcall
-	#else
-		#error "Attempting to define __declspec with an incompatible compiler !"
-	#endif
-#elif !defined(LIBARDOUR_API)
-	// Other compilers / platforms could be accommodated here
-	#define LIBARDOUR_API
-	#define LIBARDOUR_APICALLTYPE
-#endif
-
 #ifndef _MAX_PATH
 #define _MAX_PATH  260
 #endif
diff --git a/libs/ardour/ardour/session_event.h b/libs/ardour/ardour/session_event.h
index ccec43d909..e90ab71e26 100644
--- a/libs/ardour/ardour/session_event.h
+++ b/libs/ardour/ardour/session_event.h
@@ -28,6 +28,7 @@
 #include "pbd/ringbuffer.h"
 #include "pbd/event_loop.h"
 
+#include "ardour/visibility.h"
 #include "ardour/types.h"
 
 namespace ARDOUR {
@@ -35,7 +36,7 @@ namespace ARDOUR {
 class Slave;
 class Region;
 
-class SessionEvent {
+class LIBARDOUR_API SessionEvent {
 public:
 	enum Type {
 		SetTransportSpeed,
@@ -150,7 +151,7 @@ private:
 	friend class Butler;
 };
 
-class SessionEventManager {
+class LIBARDOUR_API SessionEventManager {
 public:
 	SessionEventManager () : pending_events (2048),
 	                         auto_loop_event(0), punch_out_event(0), punch_in_event(0) {}
diff --git a/libs/ardour/ardour/visibility.h b/libs/ardour/ardour/visibility.h
index 09287b877d..b702e94edb 100644
--- a/libs/ardour/ardour/visibility.h
+++ b/libs/ardour/ardour/visibility.h
@@ -20,6 +20,36 @@
 #ifndef __libardour_visibility_h__
 #define __libardour_visibility_h__
 
+#ifdef  LIBARDOUR_IS_IN_WIN_STATIC_LIB  // #define if your project uses libardour (under Windows) as a static library
+#define LIBARDOUR_IS_IN_WINDLL 0
+#endif
+
+#if !defined(LIBARDOUR_IS_IN_WINDLL)
+	#if defined(COMPILER_MSVC) || defined(COMPILER_MINGW)
+	// If you need '__declspec' compatibility, add extra compilers to the above as necessary
+		#define LIBARDOUR_IS_IN_WINDLL 1
+	#else
+		#define LIBARDOUR_IS_IN_WINDLL 0
+	#endif
+#endif
+
+#if LIBARDOUR_IS_IN_WINDLL && !defined(LIBARDOUR_API)
+	#if defined(BUILDING_LIBARDOUR)
+		#define LIBARDOUR_API __declspec(dllexport)
+		#define LIBARDOUR_APICALLTYPE __cdecl
+	#elif defined(COMPILER_MSVC) || defined(COMPILER_MINGW) // Probably needs Cygwin too, at some point
+		#define LIBARDOUR_API __declspec(dllimport)
+		#define LIBARDOUR_APICALLTYPE __cdecl
+	#else
+		#error "Attempting to define __declspec with an incompatible compiler !"
+	#endif
+#elif !defined(LIBARDOUR_API)
+	// Other compilers / platforms could be accommodated here (as an example, see LIBARDOUR_HELPER_DLL, below)
+	#define LIBARDOUR_API
+	#define LIBARDOUR_APICALLTYPE
+#endif
+
+
 /* _WIN32 is defined by most compilers targetting Windows, but within the
  * ardour source tree, we also define COMPILER_MSVC or COMPILER_MINGW depending
  * on how a Windows build is built.