diff --git a/libs/ardour/MSVClibardour/ardour.vcproj b/libs/ardour/MSVClibardour/ardour.vcproj
index ed44442a99..624e086601 100644
--- a/libs/ardour/MSVClibardour/ardour.vcproj
+++ b/libs/ardour/MSVClibardour/ardour.vcproj
@@ -1403,6 +1403,10 @@
 				RelativePath="..\version.cc"
 				>
 			</File>
+			<File
+				RelativePath="..\vst_helper.cc"
+				>
+			</File>
 			<File
 				RelativePath="..\vst_info_file.cc"
 				>