diff --git a/libs/gtkmm2ext/MSVCgtkmm2ext/gtkmm2ext.vcproj b/libs/gtkmm2ext/MSVCgtkmm2ext/gtkmm2ext.vcproj
index 6d31ddad7d..b0a8e81d34 100644
--- a/libs/gtkmm2ext/MSVCgtkmm2ext/gtkmm2ext.vcproj
+++ b/libs/gtkmm2ext/MSVCgtkmm2ext/gtkmm2ext.vcproj
@@ -281,6 +281,10 @@
 				RelativePath="..\cairo_packer.cc"
 				>
 			</File>
+			<File
+				RelativePath="..\cairo_theme.cc"
+				>
+			</File>
 			<File
 				RelativePath="..\cairo_widget.cc"
 				>
@@ -407,6 +411,10 @@
 				RelativePath="..\gtkmm2ext\cairo_packer.h"
 				>
 			</File>
+			<File
+				RelativePath="..\gtkmm2ext\cairo_theme.h"
+				>
+			</File>
 			<File
 				RelativePath="..\gtkmm2ext\cairo_widget.h"
 				>