diff --git a/msvc_extra_headers/ardourext/sys/targetsxs.h.input b/msvc_extra_headers/ardourext/sys/targetsxs.h.input
index 7ab3f68ddf..f8b8751c4a 100644
--- a/msvc_extra_headers/ardourext/sys/targetsxs.h.input
+++ b/msvc_extra_headers/ardourext/sys/targetsxs.h.input
@@ -25,9 +25,9 @@
 
 #ifndef CURRENT_SESSION_FILE_VERSION
 #ifdef  MIXBUS
-#define CURRENT_SESSION_FILE_VERSION 3002
+#define CURRENT_SESSION_FILE_VERSION 6000
 #else
-#define CURRENT_SESSION_FILE_VERSION 5990
+#define CURRENT_SESSION_FILE_VERSION 6000
 #endif
 #endif