BleiCorpus after serialize cannot be loaded

Python version 2.7.12 gensim version 0.13.2

I'm serializing my corpus into Blei LDA-C format using corpora.BleiCorpus.serialize(filename, corpus) which is then later used in a dynamic topic model, and not in python. (I know I can use the DTMModel wrapper, unrelated.)

If I need to come back and load the corpus back into Python I tried corpora.BleiCorpus.load(filename), I get an unpickling error:

 ---------------------------------------------------------------------------
 UnpicklingError                           Traceback (most recent call last)
<ipython-input-28-0dd15393a941> in <module>()
----> 1 test = corpora.BleiCorpus.load('corpus-mult.dat')

/Applications/anaconda/envs/py27/lib/python2.7/site-packages/gensim/utils.pyc in load(cls, fname, mmap)
    246         compress, subname = SaveLoad._adapt_by_suffix(fname)
    247 
--> 248         obj = unpickle(fname)
    249         obj._load_specials(fname, mmap, compress, subname)
    250         return obj

/Applications/anaconda/envs/py27/lib/python2.7/site-packages/gensim/utils.pyc in unpickle(fname)
    909     with smart_open(fname) as f:
    910         # Because of loading from S3 load can't be used (missing readline in smart_open)
--> 911         return _pickle.loads(f.read())
    912 
    913 

UnpicklingError: invalid load key, '7'.

The only other argument to load() is mmap but I don't believe the arrays were stored separately and using mmap='r' doesn't help anyway.