diff --git a/source-builder/sb/windows.py b/source-builder/sb/windows.py
index 0044ca7..901c8c8 100644
--- a/source-builder/sb/windows.py
+++ b/source-builder/sb/windows.py
@@ -74,7 +74,6 @@ def load():
         '_host_arch':     ('none',    'none',     hosttype),
         '_usr':           ('dir',     'optional', '/opt/local'),
         '_var':           ('dir',     'optional', '/opt/local/var'),
-        '_smp_mflags':    ('none',    'none',     smp_mflags),
         '__bash':         ('exe',     'required', 'bash'),
         '__bzip2':        ('exe',     'required', 'bzip2'),
         '__bison':        ('exe',     'required', 'bison'),