diff --git a/PCbuild/pythoncore.vcproj b/PCbuild/pythoncore.vcproj
index ebaa78f7cf6..8bf9770ca90 100644
--- a/PCbuild/pythoncore.vcproj
+++ b/PCbuild/pythoncore.vcproj
@@ -436,6 +436,9 @@
 		<File
 			RelativePath="..\Objects\bufferobject.c">
 		</File>
+		<File
+			RelativePath="..\Objects\bytesobject.c">
+		</File>
 		<File
 			RelativePath="..\Objects\cellobject.c">
 		</File>