diff --git a/fs/jfs/jfs_dmap.h b/fs/jfs/jfs_dmap.h
index aa03a904d5ab..e852b3cb6b61 100644
--- a/fs/jfs/jfs_dmap.h
+++ b/fs/jfs/jfs_dmap.h
@@ -191,7 +191,7 @@ typedef union dmtree {
 struct dbmap_disk {
 	__le64 dn_mapsize;	/* 8: number of blocks in aggregate	*/
 	__le64 dn_nfree;	/* 8: num free blks in aggregate map	*/
-	__le32 dn_l2nbperpage;	/* 4: number of blks per page		*/
+	__le64 dn_l2nbperpage;	/* 4: number of blks per page		*/
 	__le32 dn_numag;	/* 4: total number of ags		*/
 	__le32 dn_maxlevel;	/* 4: number of active ags		*/
 	__le32 dn_maxag;	/* 4: max active alloc group number	*/