diff --git a/django/db/backends/__init__.py b/django/db/backends/__init__.py
index 5df24eb3c8..fb38c125b7 100644
--- a/django/db/backends/__init__.py
+++ b/django/db/backends/__init__.py
@@ -126,3 +126,10 @@ class BaseDatabaseOperations(object):
         is no limit.
         """
         return None
+
+    def pk_default_value(self):
+        """
+        Returns the value to use during an INSERT statement to specify that
+        the field should use its default value.
+        """
+        return 'DEFAULT'
diff --git a/django/db/backends/ado_mssql/base.py b/django/db/backends/ado_mssql/base.py
index f42bc7e2af..3b4ffeb44f 100644
--- a/django/db/backends/ado_mssql/base.py
+++ b/django/db/backends/ado_mssql/base.py
@@ -103,9 +103,6 @@ dictfetchall  = util.dictfetchall
 def get_random_function_sql():
     return "RAND()"
 
-def get_pk_default_value():
-    return "DEFAULT"
-
 def get_start_transaction_sql():
     return "BEGIN;"
 
diff --git a/django/db/backends/dummy/base.py b/django/db/backends/dummy/base.py
index 1cee9687f7..114042a701 100644
--- a/django/db/backends/dummy/base.py
+++ b/django/db/backends/dummy/base.py
@@ -44,7 +44,6 @@ dictfetchone = complain
 dictfetchmany = complain
 dictfetchall = complain
 get_random_function_sql = complain
-get_pk_default_value = complain
 get_start_transaction_sql = complain
 get_sql_flush = complain
 get_sql_sequence_reset = complain
diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index 545ae3dcdf..9daf0e1c0b 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -165,9 +165,6 @@ dictfetchall  = util.dictfetchall
 def get_random_function_sql():
     return "RAND()"
 
-def get_pk_default_value():
-    return "DEFAULT"
-
 def get_start_transaction_sql():
     return "BEGIN;"
 
diff --git a/django/db/backends/mysql_old/base.py b/django/db/backends/mysql_old/base.py
index f445dcb8d6..dee70db41c 100644
--- a/django/db/backends/mysql_old/base.py
+++ b/django/db/backends/mysql_old/base.py
@@ -184,9 +184,6 @@ dictfetchall  = util.dictfetchall
 def get_random_function_sql():
     return "RAND()"
 
-def get_pk_default_value():
-    return "DEFAULT"
-
 def get_start_transaction_sql():
     return "BEGIN;"
 
diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 9908518d47..133f587cce 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -189,9 +189,6 @@ def get_field_cast_sql(db_type):
 def get_random_function_sql():
     return "DBMS_RANDOM.RANDOM"
 
-def get_pk_default_value():
-    return "DEFAULT"
-
 def get_start_transaction_sql():
     return None
 
diff --git a/django/db/backends/postgresql/base.py b/django/db/backends/postgresql/base.py
index 9193e532c8..fee127ec90 100644
--- a/django/db/backends/postgresql/base.py
+++ b/django/db/backends/postgresql/base.py
@@ -134,9 +134,6 @@ def dictfetchall(cursor):
 def get_random_function_sql():
     return "RANDOM()"
 
-def get_pk_default_value():
-    return "DEFAULT"
-
 def get_start_transaction_sql():
     return "BEGIN;"
 
diff --git a/django/db/backends/postgresql_psycopg2/base.py b/django/db/backends/postgresql_psycopg2/base.py
index b1611c5848..964d2688ec 100644
--- a/django/db/backends/postgresql_psycopg2/base.py
+++ b/django/db/backends/postgresql_psycopg2/base.py
@@ -88,9 +88,6 @@ dictfetchall = util.dictfetchall
 def get_random_function_sql():
     return "RANDOM()"
 
-def get_pk_default_value():
-    return "DEFAULT"
-
 def get_start_transaction_sql():
     return "BEGIN;"
 
diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index ad792e1fa0..f17eb9686f 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -48,6 +48,9 @@ class DatabaseOperations(BaseDatabaseOperations):
     def drop_foreignkey_sql(self):
         return ""
 
+    def pk_default_value(self):
+        return 'NULL'
+
 class DatabaseWrapper(BaseDatabaseWrapper):
     ops = DatabaseOperations()
 
@@ -118,9 +121,6 @@ def _sqlite_extract(lookup_type, dt):
 def get_random_function_sql():
     return "RANDOM()"
 
-def get_pk_default_value():
-    return "NULL"
-
 def get_start_transaction_sql():
     return "BEGIN;"
 
diff --git a/django/db/models/base.py b/django/db/models/base.py
index 3ae3c26fb3..d328bda31e 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -252,7 +252,7 @@ class Model(object):
                 cursor.execute("INSERT INTO %s (%s) VALUES (%s)" %
                     (backend.quote_name(self._meta.db_table),
                      backend.quote_name(self._meta.pk.column),
-                     backend.get_pk_default_value()))
+                     connection.ops.pk_default_value()))
             if self._meta.has_auto_field and not pk_set:
                 setattr(self, self._meta.pk.attname, connection.ops.last_insert_id(cursor, self._meta.db_table, self._meta.pk.column))
         transaction.commit_unless_managed()