diff --git a/PC/VS8.0/pythoncore.vcproj b/PC/VS8.0/pythoncore.vcproj
index 9139fa1becc..76fa47ec8d2 100644
--- a/PC/VS8.0/pythoncore.vcproj
+++ b/PC/VS8.0/pythoncore.vcproj
@@ -994,6 +994,22 @@
                                 RelativePath="..\..\Modules\_bytesio.c"
                                 >
                         </File>
+                        <File
+                                RelativePath="..\..\Modules\_bufferedio.c"
+                                >
+                        </File>
+                        <File
+                                RelativePath="..\..\Modules\_iobase.c"
+                                >
+                        </File>
+                        <File
+                                RelativePath="..\..\Modules\_textio.c"
+                                >
+                        </File>
+                        <File
+                                RelativePath="..\..\Modules\io.c"
+                                >
+                        </File>                        
 			<File
 				RelativePath="..\..\Modules\_functoolsmodule.c"
 				>