diff -r 678d0bfdd31a -r caaf4045eca8 mercurial/match.py
--- a/mercurial/match.py	Sat May 23 21:18:47 2015 -0700
+++ b/mercurial/match.py	Wed May 27 13:28:16 2015 -0400
@@ -50,7 +50,7 @@
 
     for kind, pat, source in kindpats:
         if kind == 'subinclude':
-            sourceroot = pathutil.dirname(source)
+            sourceroot = pathutil.dirname(util.normpath(source))
             pat = util.pconvert(pat)
             path = pathutil.join(sourceroot, pat)