diff --git a/django/contrib/gis/db/backends/mysql/base.py b/django/contrib/gis/db/backends/mysql/base.py
index 7d944587ba..2ca54a5925 100644
--- a/django/contrib/gis/db/backends/mysql/base.py
+++ b/django/contrib/gis/db/backends/mysql/base.py
@@ -1,11 +1,10 @@
-from django.db.backends.mysql.base import *
 from django.db.backends.mysql.base import DatabaseWrapper as MySQLDatabaseWrapper
 from django.contrib.gis.db.backends.mysql.creation import MySQLCreation
 from django.contrib.gis.db.backends.mysql.introspection import MySQLIntrospection
 from django.contrib.gis.db.backends.mysql.operations import MySQLOperations
 
-class DatabaseWrapper(MySQLDatabaseWrapper):
 
+class DatabaseWrapper(MySQLDatabaseWrapper):
     def __init__(self, *args, **kwargs):
         super(DatabaseWrapper, self).__init__(*args, **kwargs)
         self.creation = MySQLCreation(self)
diff --git a/django/contrib/gis/db/backends/oracle/base.py b/django/contrib/gis/db/backends/oracle/base.py
index 398b3d3b76..701a9312b3 100644
--- a/django/contrib/gis/db/backends/oracle/base.py
+++ b/django/contrib/gis/db/backends/oracle/base.py
@@ -1,9 +1,9 @@
-from django.db.backends.oracle.base import *
 from django.db.backends.oracle.base import DatabaseWrapper as OracleDatabaseWrapper
 from django.contrib.gis.db.backends.oracle.creation import OracleCreation
 from django.contrib.gis.db.backends.oracle.introspection import OracleIntrospection
 from django.contrib.gis.db.backends.oracle.operations import OracleOperations
 
+
 class DatabaseWrapper(OracleDatabaseWrapper):
     def __init__(self, *args, **kwargs):
         super(DatabaseWrapper, self).__init__(*args, **kwargs)
diff --git a/django/contrib/gis/db/backends/postgis/base.py b/django/contrib/gis/db/backends/postgis/base.py
index 634a7d5890..bdd3bdde8e 100644
--- a/django/contrib/gis/db/backends/postgis/base.py
+++ b/django/contrib/gis/db/backends/postgis/base.py
@@ -1,9 +1,9 @@
-from django.db.backends.postgresql_psycopg2.base import *
 from django.db.backends.postgresql_psycopg2.base import DatabaseWrapper as Psycopg2DatabaseWrapper
 from django.contrib.gis.db.backends.postgis.creation import PostGISCreation
 from django.contrib.gis.db.backends.postgis.introspection import PostGISIntrospection
 from django.contrib.gis.db.backends.postgis.operations import PostGISOperations
 
+
 class DatabaseWrapper(Psycopg2DatabaseWrapper):
     def __init__(self, *args, **kwargs):
         super(DatabaseWrapper, self).__init__(*args, **kwargs)