diff --git a/gnu/packages/databases.scm b/gnu/packages/databases.scm
index 578670e3c1..778c70eed0 100644
--- a/gnu/packages/databases.scm
+++ b/gnu/packages/databases.scm
@@ -704,8 +704,12 @@ Language.")
                       ;; 2030-12-31.  See <https://bugs.gnu.org/34351> for details.
                       "main.mysqldump"
 
-                      ;; XXX: Fails sporadically.
+                      ;; XXX: These tests may fail on some hardware configurations,
+                      ;; see <https://bugs.gnu.org/35521> et al.
                       "innodb_fts.crash_recovery"
+                      "tokudb_alter_table.hcad_all_add"
+                      "tokudb_bugs.mdev4533"
+                      "tokudb_bugs.5733_innodb"
 
                       ;; FIXME: This test fails on i686:
                       ;; -myisampack: Can't create/write to file (Errcode: 17 "File exists")