ValueError: numpy.dtype has the wrong size

pythonでword2vecを使おうとしたときに出たエラー

$ python word2vec.py 

Traceback (most recent call last):

  File "word2vec.py", line 3, in <module>

    from gensim.models import word2vec

  File "/Library/Python/2.7/site-packages/gensim/__init__.py", line 6, in <module>

    from gensim import parsing, matutils, interfaces, corpora, models, similarities, summarization

  File "/Library/Python/2.7/site-packages/gensim/models/__init__.py", line 14, in <module>

    from .word2vec import Word2Vec

  File "/Library/Python/2.7/site-packages/gensim/models/word2vec.py", line 108, in <module>

    from gensim.models.word2vec_inner import train_batch_sg, train_batch_cbow

  File "__init__.pxd", line 155, in init gensim.models.word2vec_inner (./gensim/models/word2vec_inner.c:10913)

ValueError: numpy.dtype has the wrong size, try recompiling. Expected 88, got 96

pipでnumpyをインストールしているとダメらしい。
easy_installで入れ直すと動く

$ pip uninstall numpy

$ easy_install numpy