diff --git a/django/core/cache/backends/locmem.py b/django/core/cache/backends/locmem.py
index cab690bb0c..73b02a55b3 100644
--- a/django/core/cache/backends/locmem.py
+++ b/django/core/cache/backends/locmem.py
@@ -27,10 +27,7 @@ class LocMemCache(BaseCache):
     def add(self, key, value, timeout=DEFAULT_TIMEOUT, version=None):
         key = self.make_key(key, version=version)
         self.validate_key(key)
-        try:
-            pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
-        except pickle.PickleError:
-            return False
+        pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
         with self._lock.writer():
             exp = self._expire_info.get(key)
             if exp is None or exp <= time.time():
@@ -69,13 +66,9 @@ class LocMemCache(BaseCache):
     def set(self, key, value, timeout=DEFAULT_TIMEOUT, version=None):
         key = self.make_key(key, version=version)
         self.validate_key(key)
-        try:
-            pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
-        except pickle.PickleError:
-            pass
-        else:
-            with self._lock.writer():
-                self._set(key, pickled, timeout)
+        pickled = pickle.dumps(value, pickle.HIGHEST_PROTOCOL)
+        with self._lock.writer():
+            self._set(key, pickled, timeout)
 
     def incr(self, key, delta=1, version=None):
         value = self.get(key, version=version)
@@ -83,13 +76,9 @@ class LocMemCache(BaseCache):
             raise ValueError("Key '%s' not found" % key)
         new_value = value + delta
         key = self.make_key(key, version=version)
-        try:
-            pickled = pickle.dumps(new_value, pickle.HIGHEST_PROTOCOL)
-        except pickle.PickleError:
-            pass
-        else:
-            with self._lock.writer():
-                self._cache[key] = pickled
+        pickled = pickle.dumps(new_value, pickle.HIGHEST_PROTOCOL)
+        with self._lock.writer():
+            self._cache[key] = pickled
         return new_value
 
     def has_key(self, key, version=None):
diff --git a/tests/cache/tests.py b/tests/cache/tests.py
index b03c3494fc..bf1543ce8a 100644
--- a/tests/cache/tests.py
+++ b/tests/cache/tests.py
@@ -5,7 +5,6 @@
 from __future__ import unicode_literals
 
 import os
-import pickle
 import re
 import shutil
 import tempfile
@@ -32,6 +31,7 @@ from django.utils import timezone
 from django.utils import translation
 from django.utils.cache import (patch_vary_headers, get_cache_key,
     learn_cache_key, patch_cache_control, patch_response_headers)
+from django.utils.six.moves import cPickle as pickle
 from django.utils.encoding import force_text
 from django.views.decorators.cache import cache_page