hg don't compare by sum

Is there a way to force a file revert? Or compare files based on sum?

make -f client.mk
security/nss/lib/pkcs7/p7decode.c(734) : error C2018: unknown character '0xf'
$ hg -v revert security/nss/lib/pkcs7/p7decode.c
no changes needed to security\nss\lib\pkcs7\p7decode.c
$ hg diff security/nss/lib/pkcs7/p7decode.c

$ hg status security/nss/lib/pkcs7/p7decode.c

$ crc32 security/nss/lib/pkcs7/p7decode.c
9bf82cce
$ crc32 security/nss/lib/pkcs7/p7decode.good.c
f9d96779