diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 9943ac9610..188c4bb678 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -122,7 +122,6 @@ OPERATOR_MAPPING = {
     'iexact': 'LIKE %s',
     'contains': 'LIKE %s',
     'icontains': 'LIKE %s',
-    'ne': '!= %s',
     'gt': '> %s',
     'gte': '>= %s',
     'lt': '< %s',
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 5882423509..f99f555625 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -162,7 +162,7 @@ class Field(object):
 
     def get_db_prep_lookup(self, lookup_type, value):
         "Returns field's value prepared for database lookup."
-        if lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte', 'ne', 'year', 'month', 'day', 'search'):
+        if lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte', 'year', 'month', 'day', 'search'):
             return [value]
         elif lookup_type in ('range', 'in'):
             return value
@@ -414,7 +414,7 @@ class DateField(Field):
     def get_db_prep_lookup(self, lookup_type, value):
         if lookup_type == 'range':
             value = [str(v) for v in value]
-        elif lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte', 'ne') and hasattr(value, 'strftime'):
+        elif lookup_type in ('exact', 'gt', 'gte', 'lt', 'lte') and hasattr(value, 'strftime'):
             value = value.strftime('%Y-%m-%d')
         else:
             value = str(value)