diff --git a/strokefont.py b/strokefont.py
index 75f315a..477fb74 100644
--- a/strokefont.py
+++ b/strokefont.py
@@ -22,6 +22,7 @@ class Stroker(object):
         f.fullname = self.fullname
         f.private['StdHW'] = self.nibheight
         f.private['StdVW'] = self.nibwidth
+        f.uwidth = self.nibheight
         f.os2_weight = self.ttfweight
         f.weight = self.weight
         return f