diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 841ca92f3e..c6cda55229 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -84,8 +84,9 @@ Database.register_converter(str("decimal"), decoder(util.typecast_decimal))
 
 Database.register_adapter(datetime.datetime, adapt_datetime_with_timezone_support)
 Database.register_adapter(decimal.Decimal, util.rev_typecast_decimal)
-Database.register_adapter(str, lambda s: s.decode('utf-8'))
-Database.register_adapter(SafeBytes, lambda s: s.decode('utf-8'))
+if not six.PY3:
+    Database.register_adapter(str, lambda s: s.decode('utf-8'))
+    Database.register_adapter(SafeBytes, lambda s: s.decode('utf-8'))
 
 
 class DatabaseFeatures(BaseDatabaseFeatures):