diff --git a/oslo_db/sqlalchemy/ndb.py b/oslo_db/sqlalchemy/ndb.py
index a3927cc3..59ec1003 100644
--- a/oslo_db/sqlalchemy/ndb.py
+++ b/oslo_db/sqlalchemy/ndb.py
@@ -15,14 +15,10 @@
 
 import re
 
-import debtcollector.removals
-
 from oslo_db.sqlalchemy.compat import utils as compat_utils
 from oslo_db.sqlalchemy.types import String
 
 from sqlalchemy import event, schema
-from sqlalchemy.dialects.mysql import TEXT
-from sqlalchemy.dialects.mysql import TINYTEXT
 from sqlalchemy.ext.compiler import compiles
 from sqlalchemy.types import String as _String
 from sqlalchemy.types import to_instance
@@ -112,18 +108,3 @@ def _compile_ndb_string(element, compiler, **kw):
         return compiler.process(effective_type, **kw)
     else:
         return compiler.visit_string(element, **kw)
-
-
-@debtcollector.removals.remove
-def AutoStringTinyText(length, **kw):
-    return String(length, mysql_ndb_type=TINYTEXT, *kw)
-
-
-@debtcollector.removals.remove
-def AutoStringText(length, **kw):
-    return String(length, mysql_ndb_type=TEXT, **kw)
-
-
-@debtcollector.removals.remove
-def AutoStringSize(length, ndb_size, **kw):
-    return String(length, mysql_ndb_length=ndb_size, **kw)
diff --git a/oslo_db/tests/sqlalchemy/test_ndb.py b/oslo_db/tests/sqlalchemy/test_ndb.py
index ea2c643b..1d84f41a 100644
--- a/oslo_db/tests/sqlalchemy/test_ndb.py
+++ b/oslo_db/tests/sqlalchemy/test_ndb.py
@@ -111,24 +111,6 @@ class NDBEventTestCase(NDBMockTestBase):
 
 
 class NDBDatatypesTestCase(NDBMockTestBase):
-    def test_ndb_deprecated_autostringtinytext(self):
-        test_engine = self.test_engine
-        self.assertEqual("TINYTEXT",
-                         str(ndb.AutoStringTinyText(255).compile(
-                             dialect=test_engine.dialect)))
-
-    def test_ndb_deprecated_autostringtext(self):
-        test_engine = self.test_engine
-        self.assertEqual("TEXT",
-                         str(ndb.AutoStringText(4096).compile(
-                             dialect=test_engine.dialect)))
-
-    def test_ndb_deprecated_autostringsize(self):
-        test_engine = self.test_engine
-        self.assertEqual('VARCHAR(64)',
-                         str(ndb.AutoStringSize(255, 64).compile(
-                             dialect=test_engine.dialect)))
-
     def test_ndb_string_to_tinytext(self):
         test_engine = self.test_engine
         self.assertEqual("TINYTEXT",