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diff --git a/lib/system.h b/lib/system.h
index ef46267..e7f531c 100644
--- a/lib/system.h
+++ b/lib/system.h
@@ -389,9 +389,16 @@ extern int errno;
# define ST_NBLOCKSIZE 512
#endif
+/* Network Appliance file systems store small files directly in the
+ inode if st_size <= 64; in this case the number of blocks can be
+ zero. Perhaps other file systems have similar problems; so,
+ somewhat arbitrarily, do not consider a file to be sparse if
+ it has no blocks but st_size < ST_NBLOCKSIZE. */
#define ST_IS_SPARSE(st) \
(ST_NBLOCKS (st) \
- < ((st).st_size / ST_NBLOCKSIZE + ((st).st_size % ST_NBLOCKSIZE != 0)))
+ < ((st).st_size / ST_NBLOCKSIZE \
+ + ((st).st_size % ST_NBLOCKSIZE != 0 \
+ && (st).st_size / ST_NBLOCKSIZE != 0)))
/* Declare standard functions. */