Getting error message: pristine-tar: delta is version 3, newer than maximum supported version 2

Due to an bug inside Ubuntu's patched PyQt5, I wanted to rebuild a more recent PyQt5.
I imported it from debian's repository and created an recipe (https://code.launchpad.net/~thopiekar/+recipe/pyqt5-debian-daily).

However, when building from these sources, I get the error:

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Git version:
git version 2.7.4
git-build-recipe 0.3.4~git201611291343.dcee459~ubuntu16.04.1
Building recipe:
# git-build-recipe format 0.4 deb-version {debversion}~{time}~rev{revno}
lp:~thopiekar/ultimaker/+git/dep-pyqt5-from-debian debian/5.9+dfsg-2

RUN ['git-build-recipe', '--safe', '--no-build', '--manifest', '/home/buildd/build-RECIPEBRANCHBUILD-1479521/chroot-autobuild/home/buildd/work/tree/manifest', '--distribution', 'artful', '--allow-fallback-to-native', '--append-version', '~ubuntu17.10.1', '/home/buildd/build-RECIPEBRANCHBUILD-1479521/chroot-autobuild/home/buildd/work/recipe', '/home/buildd/build-RECIPEBRANCHBUILD-1479521/chroot-autobuild/home/buildd/work/tree']
pristine-tar: delta is version 3, newer than maximum supported version 2
pristine-tar: failed to generate tarball
Traceback (most recent call last):
  File "/usr/bin/git-build-recipe", line 9, in <module>
    load_entry_point('git-build-recipe==0.1', 'console_scripts', 'git-build-recipe')()
  File "/usr/lib/python3/dist-packages/gitbuildrecipe/main.py", line 164, in main
    package_version.upstream_version, working_basedir)
  File "/usr/lib/python3/dist-packages/gitbuildrecipe/deb_util.py", line 74, in extract_upstream_tarball
    cwd=path)
  File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['pristine-tar', 'checkout', '/home/buildd/build-RECIPEBRANCHBUILD-1479521/chroot-autobuild/home/buildd/work/tree/pyqt5_5.9+dfsg.orig.tar.gz']' returned non-zero exit status 255
resource.struct_rusage(ru_utime=1.8679999999999999, ru_stime=0.696, ru_maxrss=29404, ru_ixrss=0, ru_idrss=0, ru_isrss=0, ru_minflt=41357, ru_majflt=42, ru_nswap=0, ru_inblock=12560, ru_oublock=150840, ru_msgsnd=0, ru_msgrcv=0, ru_nsignals=0, ru_nvcsw=14402, ru_nivcsw=5889)
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- https://launchpadlibrarian.net/344955618/buildlog.txt.gz

when trying to build the source package. But I have no idea, how to correct the "pristine-tar: delta is version 3, newer than maximum supported version 2" issue. Are my recipe instructions wrong or is there something else?

Thanks!