diff --git a/MSVCardour3/Ardour3.vcproj b/MSVCardour3/Ardour3.vcproj
index 0e2bc865b2..7f89dda3cb 100644
--- a/MSVCardour3/Ardour3.vcproj
+++ b/MSVCardour3/Ardour3.vcproj
@@ -659,6 +659,10 @@
 				RelativePath="..\gtk2_ardour\global_port_matrix.cc"
 				>
 			</File>
+			<File
+				RelativePath="..\gtk2_ardour\grid_lines.cc"
+				>
+			</File>
 			<File
 				RelativePath="..\gtk2_ardour\group_tabs.cc"
 				>
@@ -1697,6 +1701,10 @@
 				RelativePath="..\gtk2_ardour\global_port_matrix.h"
 				>
 			</File>
+			<File
+				RelativePath="..\gtk2_ardour\grid_lines.h"
+				>
+			</File>
 			<File
 				RelativePath="..\gtk2_ardour\group_tabs.h"
 				>