diff --git a/django/contrib/formtools/utils.py b/django/contrib/formtools/utils.py
index 90b4fe650b..1f5beb153d 100644
--- a/django/contrib/formtools/utils.py
+++ b/django/contrib/formtools/utils.py
@@ -15,19 +15,8 @@ def security_hash(request, form, *args):
         order, pickles the result with the SECRET_KEY setting, then takes an md5
         hash of that.
         """
-        # Ensure that the hash does not change when a BooleanField's bound
-        # data is a string `False' or a boolean False.
-        # Rather than re-coding this special behaviour here, we
-        # create a dummy BooleanField and call its clean method to get a
-        # boolean True or False verdict that is consistent with
-        # BooleanField.clean()
-        dummy_bool = BooleanField(required=False)
-        def _cleaned_data(bf):
-            if isinstance(bf.field, BooleanField):
-                return dummy_bool.clean(bf.data)
-            return bf.data
         
-        data = [(bf.name, _cleaned_data(bf) or '') for bf in form]
+        data = [(bf.name, bf.field.clean(bf.data) or '') for bf in form]
         data.extend(args)
         data.append(settings.SECRET_KEY)