diff --git a/SCons/Tools/mstoolkit.py b/SCons/Tools/mstoolkit.py
index a7fe266f..d9f58b5e 100644
--- a/SCons/Tools/mstoolkit.py
+++ b/SCons/Tools/mstoolkit.py
@@ -338,6 +338,8 @@ def generate(env):
 	env['REGSVRFLAGS'] = '/s '
 	env['REGSVRCOM'] = '$REGSVR $REGSVRFLAGS $TARGET'
 
+  env['MSVS_VERSION'] = '7.1'
+
 
 def exists(env):
 	return env.Detect('cl')