diff --git a/Visual Studio Projects/PDP10-KS.vcproj b/Visual Studio Projects/PDP10-KS.vcproj
index 98054cb..47a7c27 100644
--- a/Visual Studio Projects/PDP10-KS.vcproj	
+++ b/Visual Studio Projects/PDP10-KS.vcproj	
@@ -197,6 +197,9 @@
 				RelativePath="..\PDP10\ks10_cty.c"
 				>
 			</File>
+			<File
+				RelativePath="..\PDP10\ks10_ch11.c"
+				>
 			<File
 				RelativePath="..\PDP10\ks10_dz.c"
 				>