diff --git a/PC/VC6/pythoncore.dsp b/PC/VC6/pythoncore.dsp
index 31008e8a70b..a4026dacc73 100644
--- a/PC/VC6/pythoncore.dsp
+++ b/PC/VC6/pythoncore.dsp
@@ -149,6 +149,10 @@ SOURCE=..\..\Modules\_sre.c
 # End Source File
 # Begin Source File
 
+SOURCE=..\..\PC\_subprocess.c
+# End Source File
+# Begin Source File
+
 SOURCE=..\..\Modules\_weakref.c
 # End Source File
 # Begin Source File