diff --git a/django/template/defaultfilters.py b/django/template/defaultfilters.py
index dac4e5ddb41..85202b62a4b 100644
--- a/django/template/defaultfilters.py
+++ b/django/template/defaultfilters.py
@@ -49,15 +49,6 @@ def stringfilter(func):
     # when multiple decorators are applied).
     _dec._decorated_function = getattr(func, '_decorated_function', func)
 
-    for attr in ('is_safe', 'needs_autoescape'):
-        if hasattr(func, attr):
-            import warnings
-            warnings.warn("Setting the %s attribute of a template filter "
-                          "function is deprecated; use @register.filter(%s=%s) "
-                          "instead" % (attr, attr, getattr(func, attr)),
-                          DeprecationWarning)
-            setattr(_dec, attr, getattr(func, attr))
-
     return wraps(func)(_dec)
 
 
diff --git a/docs/howto/custom-template-tags.txt b/docs/howto/custom-template-tags.txt
index 70b6288beed..d57730c4fb4 100644
--- a/docs/howto/custom-template-tags.txt
+++ b/docs/howto/custom-template-tags.txt
@@ -328,26 +328,6 @@ Template filter code falls into one of two situations:
    handle the auto-escaping issues and return a safe string, the
    ``is_safe`` flag won't change anything either way.
 
-.. versionchanged:: 1.4
-
-``is_safe`` and ``needs_autoescape`` used to be attributes of the filter
-function; this syntax is deprecated.
-
-.. code-block:: python
-
-    @register.filter
-    def myfilter(value):
-        return value
-    myfilter.is_safe = True
-
-.. code-block:: python
-
-    @register.filter
-    def initial_letter_filter(text, autoescape=None):
-        # ...
-        return mark_safe(result)
-    initial_letter_filter.needs_autoescape = True
-
 .. _filters-timezones:
 
 Filters and time zones