Indexing an array of size between 2^31 and 2^32-1 with LP64?

I am working with spblas. My matrix dimension is about 300k, nnz is between 2^31 and 2^32-1. To keep the memory consumption as small as possible. I would like to use 32bit unsigned integer to index my element. Is it possible to do so with LP64 by defining MKL_INT as uint32_t? I tried it, but my program crashed with a segmentation fault when calling mkl_scsrmv.