diff --git a/disk/disk_unix.go b/disk/disk_unix.go
index af4901d..31f25b9 100644
--- a/disk/disk_unix.go
+++ b/disk/disk_unix.go
@@ -16,7 +16,7 @@ func DiskUsage(path string) (*DiskUsageStat, error) {
 	ret := &DiskUsageStat{
 		Path:        path,
 		Total:       (uint64(stat.Blocks) * uint64(bsize)),
-		Free:        (uint64(stat.Bavail) * uint64(bsize)),
+		Free:        (uint64(stat.Bfree) * uint64(bsize)),
 		InodesTotal: (uint64(stat.Files)),
 		InodesFree:  (uint64(stat.Ffree)),
 	}