diff --git a/HACKING.rst b/HACKING.rst
index bbebe43810..679c8ce0cf 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -12,7 +12,6 @@ Manila Specific Commandments
 - [M310] Check for improper use of logging format arguments.
 - [M313] Use assertTrue(...) rather than assertEqual(True, ...).
 - [M323] Ensure that the _() function is explicitly imported to ensure proper translations.
-- [M325] str() and unicode() cannot be used on an exception. Remove or use six.text_type().
 - [M326] Translated messages cannot be concatenated.  String should be
   included in translated message.
 - [M333] ``oslo_`` should be used instead of ``oslo.``
diff --git a/manila/tests/hacking/checks.py b/manila/tests/hacking/checks.py
index f66e554688..4f41bf7d1b 100644
--- a/manila/tests/hacking/checks.py
+++ b/manila/tests/hacking/checks.py
@@ -197,55 +197,6 @@ def check_explicit_underscore_import(logical_line, filename):
         yield(0, "M323: Found use of _() without explicit import of _ !")
 
 
-class CheckForStrUnicodeExc(BaseASTChecker):
-    """Checks for the use of str() or unicode() on an exception.
-
-    This currently only handles the case where str() or unicode()
-    is used in the scope of an exception handler.  If the exception
-    is passed into a function, returned from an assertRaises, or
-    used on an exception created in the same scope, this does not
-    catch it.
-    """
-
-    name = "check_for_str_unicode_exc"
-    version = "1.0"
-    CHECK_DESC = ('M325 str() and unicode() cannot be used on an '
-                  'exception.  Remove or use six.text_type()')
-
-    def __init__(self, tree, filename):
-        super(CheckForStrUnicodeExc, self).__init__(tree, filename)
-        self.name = []
-        self.already_checked = []
-
-    # Python 2
-    def visit_TryExcept(self, node):
-        for handler in node.handlers:
-            if handler.name:
-                self.name.append(handler.name.id)
-                super(CheckForStrUnicodeExc, self).generic_visit(node)
-                self.name = self.name[:-1]
-            else:
-                super(CheckForStrUnicodeExc, self).generic_visit(node)
-
-    # Python 3
-    def visit_ExceptHandler(self, node):
-        if node.name:
-            self.name.append(node.name)
-            super(CheckForStrUnicodeExc, self).generic_visit(node)
-            self.name = self.name[:-1]
-        else:
-            super(CheckForStrUnicodeExc, self).generic_visit(node)
-
-    def visit_Call(self, node):
-        if self._check_call_names(node, ['str', 'unicode']):
-            if node not in self.already_checked:
-                self.already_checked.append(node)
-                if isinstance(node.args[0], ast.Name):
-                    if node.args[0].id in self.name:
-                        self.add_error(node.args[0])
-        super(CheckForStrUnicodeExc, self).generic_visit(node)
-
-
 class CheckForTransAdd(BaseASTChecker):
     """Checks for the use of concatenation on a translated string.
 
diff --git a/manila/tests/test_hacking.py b/manila/tests/test_hacking.py
index b5bb03ef8b..4cc16d4e95 100644
--- a/manila/tests/test_hacking.py
+++ b/manila/tests/test_hacking.py
@@ -158,79 +158,6 @@ class HackingTestCase(test.TestCase):
         self._assert_has_errors(code.format(log_method), checker,
                                 expected_errors=[(4, mock.ANY, 'M310')])
 
-    def test_str_on_exception(self):
-
-        checker = checks.CheckForStrUnicodeExc
-        code = """
-               def f(a, b):
-                   try:
-                       p = str(a) + str(b)
-                   except ValueError as e:
-                       p = str(e)
-                   return p
-               """
-        errors = [(5, 16, 'M325')]
-        self._assert_has_errors(code, checker, expected_errors=errors)
-
-    def test_no_str_unicode_on_exception(self):
-        checker = checks.CheckForStrUnicodeExc
-        code = """
-               def f(a, b):
-                   try:
-                       p = unicode(a) + str(b)
-                   except ValueError as e:
-                       p = e
-                   return p
-               """
-        self._assert_has_no_errors(code, checker)
-
-    def test_unicode_on_exception(self):
-        checker = checks.CheckForStrUnicodeExc
-        code = """
-               def f(a, b):
-                   try:
-                       p = str(a) + str(b)
-                   except ValueError as e:
-                       p = unicode(e)
-                   return p
-               """
-        errors = [(5, 20, 'M325')]
-        self._assert_has_errors(code, checker, expected_errors=errors)
-
-    def test_str_on_multiple_exceptions(self):
-        checker = checks.CheckForStrUnicodeExc
-        code = """
-               def f(a, b):
-                   try:
-                       p = str(a) + str(b)
-                   except ValueError as e:
-                       try:
-                           p  = unicode(a) + unicode(b)
-                       except ValueError as ve:
-                           p = str(e) + str(ve)
-                       p = e
-                   return p
-               """
-        errors = [(8, 20, 'M325'), (8, 29, 'M325')]
-        self._assert_has_errors(code, checker, expected_errors=errors)
-
-    def test_str_unicode_on_multiple_exceptions(self):
-        checker = checks.CheckForStrUnicodeExc
-        code = """
-               def f(a, b):
-                   try:
-                       p = str(a) + str(b)
-                   except ValueError as e:
-                       try:
-                           p  = unicode(a) + unicode(b)
-                       except ValueError as ve:
-                           p = str(e) + unicode(ve)
-                       p = str(e)
-                   return p
-               """
-        errors = [(8, 20, 'M325'), (8, 33, 'M325'), (9, 16, 'M325')]
-        self._assert_has_errors(code, checker, expected_errors=errors)
-
     def test_trans_add(self):
 
         checker = checks.CheckForTransAdd
diff --git a/tox.ini b/tox.ini
index ad2fb0eef6..4c3e234bf2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -151,7 +151,6 @@ extension =
     M310 = checks:CheckLoggingFormatArgs
     M313 = checks:validate_assertTrue
     M323 = checks:check_explicit_underscore_import
-    M325 = checks:CheckForStrUnicodeExc
     M326 = checks:CheckForTransAdd
     M333 = checks:check_oslo_namespace_imports
     M336 = checks:dict_constructor_with_list_copy