diff --git a/mercurial/bundlerepo.py b/mercurial/bundlerepo.py
--- a/mercurial/bundlerepo.py
+++ b/mercurial/bundlerepo.py
@@ -115,7 +115,8 @@ class bundlerevlog(revlog.revlog):
         elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
             return revlog.revlog.revdiff(self, rev1, rev2)
 
-        return mdiff.textdiff(self.revision(rev1), self.revision(rev2))
+        return mdiff.textdiff(self.revision(rev1, raw=True),
+                              self.revision(rev2, raw=True))
 
     def revision(self, nodeorrev, raw=False):
         """return an uncompressed revision of a given node or revision
diff --git a/tests/test-flagprocessor.t b/tests/test-flagprocessor.t
--- a/tests/test-flagprocessor.t
+++ b/tests/test-flagprocessor.t
@@ -216,5 +216,27 @@
   $ hg bundle -R bundle.hg --base 1 bundle-again.hg -q 2>&1 | egrep -v '^(\*\*|  )'
   [1]
   $ hg -R bundle-again.hg log --stat -T '{rev} {desc}\n' base64 2>&1 | egrep -v '^(\*\*|  )'
-  Traceback (most recent call last):
-  TypeError: Incorrect padding
+  5 branching
+   base64 |  2 +-
+   1 files changed, 1 insertions(+), 1 deletions(-)
+  
+  4 base64-4
+   base64 |  2 +-
+   1 files changed, 1 insertions(+), 1 deletions(-)
+  
+  3 base64-three
+   base64 |  2 +-
+   1 files changed, 1 insertions(+), 1 deletions(-)
+  
+  2 base64-two
+   base64 |  2 +-
+   1 files changed, 1 insertions(+), 1 deletions(-)
+  
+  1 base64-single
+   base64 |  2 +-
+   1 files changed, 1 insertions(+), 1 deletions(-)
+  
+  0 base64-0
+   base64 |  1 +
+   1 files changed, 1 insertions(+), 0 deletions(-)
+