diff --git a/mercurial/color.py b/mercurial/color.py
--- a/mercurial/color.py
+++ b/mercurial/color.py
@@ -484,7 +484,7 @@
             _win32print(ui, text, writefunc, **opts)
 
     def _win32print(ui, text, writefunc, **opts):
-        label = opts.get('label', '')
+        label = opts.get(r'label', '')
         attr = origattr
 
         def mapcolor(val, attr):