diff --git a/mkfs/proto.c b/mkfs/proto.c
index 933924e..d99e965 100644
--- a/mkfs/proto.c
+++ b/mkfs/proto.c
@@ -653,7 +653,7 @@
 	mp->m_sb.sb_rbmino = rbmip->i_ino;
 	rbmip->i_d.di_size = mp->m_sb.sb_rbmblocks * mp->m_sb.sb_blocksize;
 	rbmip->i_d.di_flags = XFS_DIFLAG_NEWRTBM;
-	*(__uint64_t *)&VFS_I(mp->m_rbmip)->i_atime = 0;
+	*(__uint64_t *)&VFS_I(rbmip)->i_atime = 0;
 	libxfs_trans_log_inode(tp, rbmip, XFS_ILOG_CORE);
 	libxfs_log_sb(tp);
 	mp->m_rbmip = rbmip;