diff --git a/libs/ardour/MSVClibardour/ardour.vcproj b/libs/ardour/MSVClibardour/ardour.vcproj
index 0573c896ce..e8430ae839 100644
--- a/libs/ardour/MSVClibardour/ardour.vcproj
+++ b/libs/ardour/MSVClibardour/ardour.vcproj
@@ -2201,6 +2201,10 @@
 				RelativePath="..\ardour\utils.h"
 				>
 			</File>
+			<File
+				RelativePath="..\ardour\variant.h"
+				>
+			</File>
 			<File
 				RelativePath="..\ardour\vst_plugin.h"
 				>