diff --git a/libs/ardour/MSVClibardour/ardour.vcproj b/libs/ardour/MSVClibardour/ardour.vcproj
index 2408061058..d577909226 100644
--- a/libs/ardour/MSVClibardour/ardour.vcproj
+++ b/libs/ardour/MSVClibardour/ardour.vcproj
@@ -423,6 +423,10 @@
 				RelativePath="..\chan_mapping.cc"
 				>
 			</File>
+			<File
+				RelativePath="..\circular_buffer.cc"
+				>
+			</File>
 			<File
 				RelativePath="..\config_text.cc"
 				>
@@ -1685,6 +1689,10 @@
 				RelativePath="..\ardour\chan_mapping.h"
 				>
 			</File>
+			<File
+				RelativePath="..\ardour\circular_buffer.h"
+				>
+			</File>
 			<File
 				RelativePath="..\ardour\click.h"
 				>