--- a/tests/test-revlog.t	Wed Mar 30 22:01:47 2016 +0000
+++ b/tests/test-revlog.t	Thu Mar 31 02:05:28 2016 +0000
@@ -11,5 +11,5 @@
      rev    offset  length  delta linkrev nodeid       p1           p2
        0         0      19     -1       2 99e0332bd498 000000000000 000000000000
        1        19      12      0       3 6674f57a23d8 99e0332bd498 000000000000
-  $ hg debugdata a.i 1 2>&1 | grep decoded
-  mpatch.mpatchError: patch cannot be decoded
+  $ hg debugdata a.i 1 2>&1 | egrep 'Error:.*decoded'
+  mercurial.mpatch.mpatchError: patch cannot be decoded