autopkgtest failure: tests.test_pep8.AptDaemonPep8TestCase

The following test failed with aptdaemon 1.1.1-0ubuntu1 in autopkgtest [1]

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ERROR: test (tests.test_pep8.AptDaemonPep8TestCase)
Check if the source code matches the PEP8 style conventions.
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Traceback (most recent call last):
  File "/tmp/tmp.1E8EpDvqet/dsc0-build/aptdaemon-1.1.1/tests/test_pep8.py", line 35, in test
    "aptdaemon", "tests"])
  File "/usr/lib/python3.3/subprocess.py", line 544, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['pep8', '--statistics', '--show-source', '--show-pep8', '--exclude', 'pkenums.py', 'aptdaemon', 'tests']' returned non-zero exit status 1

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The cause is:
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ubuntu@autopkgtest:~/aptdaemon-1.1.1❭ pep8 --show-source --exclude pkenums.py aptdaemon tests
aptdaemon/gtk3widgets.py:511:22: E128 continuation line under-indented for visual indent
                     apt_pkg.size_to_str(full_size)))
                     ^
-----
There is a space missing

[1] https://jenkins.qa.ubuntu.com/view/Saucy/view/AutoPkgTest/job/saucy-adt-aptdaemon/ARCH=amd64,label=adt/50/

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: aptdaemon 1.0-0ubuntu10
ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
Uname: Linux 3.11.0-4-generic x86_64
ApportVersion: 2.12.1-0ubuntu3
Architecture: amd64
Date: Wed Sep 4 15:01:43 2013
MarkForUpload: True
PackageArchitecture: all
SourcePackage: aptdaemon
SysLog:

UpgradeStatus: Upgraded to saucy on 2012-01-31 (581 days ago)