bzip2 on AIX 5.3

Hi.
I have the bzip2 version 1.0.2 installed on AIX 5.3 (RPM package). The documentation (www.bzip.org) says that this version can compress files >2Gb, but is not working. On AIX, bzip2 is working well just for files less than 2Gb. I have the bzip2 (same version) installed on Linux box. The problem is happening only on AIX. Does some one have an ideia about solution for this problem ? Thanks.