diff --git a/sql/handler.cc b/sql/handler.cc
index 150bbee39a9..ee505bfd5ff 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -232,13 +232,6 @@ handlerton *ha_checktype(THD *thd, enum legacy_db_type database_type,
 
   RUN_HOOK(transaction, after_rollback, (thd, FALSE));
 
-  switch (database_type) {
-  case DB_TYPE_MRG_ISAM:
-    return ha_resolve_by_legacy_type(thd, DB_TYPE_MRG_MYISAM);
-  default:
-    break;
-  }
-
   return ha_default_handlerton(thd);
 } /* ha_checktype */
 
diff --git a/sql/handler.h b/sql/handler.h
index 7c8cc98b37c..2acec83d3ca 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -336,25 +336,23 @@
 
 enum legacy_db_type
 {
-  DB_TYPE_UNKNOWN=0,DB_TYPE_DIAB_ISAM=1,
-  DB_TYPE_HASH,DB_TYPE_MISAM,DB_TYPE_PISAM,
-  DB_TYPE_RMS_ISAM, DB_TYPE_HEAP, DB_TYPE_ISAM,
-  DB_TYPE_MRG_ISAM, DB_TYPE_MYISAM, DB_TYPE_MRG_MYISAM,
-  DB_TYPE_BERKELEY_DB, DB_TYPE_INNODB,
-  DB_TYPE_GEMINI, DB_TYPE_NDBCLUSTER,
-  DB_TYPE_EXAMPLE_DB, DB_TYPE_ARCHIVE_DB, DB_TYPE_CSV_DB,
-  DB_TYPE_FEDERATED_DB,
-  DB_TYPE_BLACKHOLE_DB,
-  DB_TYPE_PARTITION_DB,
-  DB_TYPE_BINLOG,
-  DB_TYPE_SOLID,
-  DB_TYPE_PBXT,
-  DB_TYPE_TABLE_FUNCTION,
-  DB_TYPE_MEMCACHE,
-  DB_TYPE_FALCON,
-  DB_TYPE_MARIA,
-  /** Performance schema engine. */
-  DB_TYPE_PERFORMANCE_SCHEMA,
+  /* note these numerical values are fixed and can *not* be changed */
+  DB_TYPE_UNKNOWN=0,
+  DB_TYPE_HEAP=6,
+  DB_TYPE_MYISAM=9,
+  DB_TYPE_MRG_MYISAM=10,
+  DB_TYPE_INNODB=12,
+  DB_TYPE_NDBCLUSTER=14,
+  DB_TYPE_EXAMPLE_DB=15,
+  DB_TYPE_ARCHIVE_DB=16,
+  DB_TYPE_CSV_DB=17,
+  DB_TYPE_FEDERATED_DB=18,
+  DB_TYPE_BLACKHOLE_DB=19,
+  DB_TYPE_PARTITION_DB=20,
+  DB_TYPE_BINLOG=21,
+  DB_TYPE_PBXT=23,
+  DB_TYPE_MARIA=27,
+  DB_TYPE_PERFORMANCE_SCHEMA=28,
   DB_TYPE_FIRST_DYNAMIC=42,
   DB_TYPE_DEFAULT=127 // Must be last
 };