diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index dce8114e3198c349b2f36b312a71adc92236cf48..e126bc6cdeb8781d5f71631cf4993e5c8fdf2fba 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1114,7 +1114,8 @@ xfs_fs_statfs(
 	statp->f_blocks = sbp->sb_dblocks - lsize;
 	spin_unlock(&mp->m_sb_lock);
 
-	statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
+	/* make sure statp->f_bfree does not underflow */
+	statp->f_bfree = max_t(int64_t, fdblocks - mp->m_alloc_set_aside, 0);
 	statp->f_bavail = statp->f_bfree;
 
 	fakeinos = statp->f_bfree << sbp->sb_inopblog;