diff --git a/strokefont.py b/strokefont.py
index 4b257d6..49494e8 100644
--- a/strokefont.py
+++ b/strokefont.py
@@ -22,6 +22,10 @@ class Stroker(object):
         f.fullname = self.fullname
         f.private['StdHW'] = self.nibheight
         f.private['StdVW'] = self.nibwidth
+        def adjustblue(y): return y - 100 + self.nibheight
+        bv = list(f.private['BlueValues'])
+        bv[1:] = map(adjustblue, bv[1:])
+        f.private['BlueValues'] = tuple(bv)
         f.uwidth = self.nibheight
         f.os2_weight = self.ttfweight
         f.weight = self.weight