diff --git a/peewee_async.py b/peewee_async.py
index 0d870b1..c48489c 100644
--- a/peewee_async.py
+++ b/peewee_async.py
@@ -1174,7 +1174,7 @@ def use_speedups(self, value):
         pass
 
 
-register_database(PostgresqlDatabase, ['postgres+async', 'postgresql+async'])
+register_database(PostgresqlDatabase, 'postgres+async', 'postgresql+async')
 
 
 class PooledPostgresqlDatabase(AsyncPostgresqlMixin, peewee.PostgresqlDatabase):
@@ -1205,7 +1205,7 @@ def use_speedups(self, value):
         pass
 
 
-register_database(PooledPostgresqlDatabase, ['postgres+pool+async', 'postgresql+pool+async'])
+register_database(PooledPostgresqlDatabase, 'postgres+pool+async', 'postgresql+pool+async')
 
 
 #########
@@ -1326,7 +1326,7 @@ def use_speedups(self, value):
         pass
 
 
-register_database(MySQLDatabase, ['mysql+async'])
+register_database(MySQLDatabase, 'mysql+async')
 
 
 class PooledMySQLDatabase(MySQLDatabase):
@@ -1350,7 +1350,7 @@ def init(self, database, **kwargs):
         self.max_connections = max_connections
 
 
-register_database(PooledMySQLDatabase, ['mysql+pool+async'])
+register_database(PooledMySQLDatabase, 'mysql+pool+async')
 
 
 ##############
diff --git a/peewee_asyncext.py b/peewee_asyncext.py
index d29ab75..f5e598b 100644
--- a/peewee_asyncext.py
+++ b/peewee_asyncext.py
@@ -49,7 +49,7 @@ def use_speedups(self, value):
         pass
 
 
-register_database(PostgresqlExtDatabase, ['postgresext+async', 'postgresqlext+async'])
+register_database(PostgresqlExtDatabase, 'postgresext+async', 'postgresqlext+async')
 
 
 class PooledPostgresqlExtDatabase(AsyncPostgresqlMixin, ext.PostgresqlExtDatabase):
@@ -85,4 +85,4 @@ def use_speedups(self, value):
         pass
 
 
-register_database(PooledPostgresqlExtDatabase, ['postgresext+pool+async', 'postgresqlext+pool+async'])
+register_database(PooledPostgresqlExtDatabase, 'postgresext+pool+async', 'postgresqlext+pool+async')