diff --git a/plugins/dbms/firebird/syntax.py b/plugins/dbms/firebird/syntax.py
index c73325df5..695a4598d 100644
--- a/plugins/dbms/firebird/syntax.py
+++ b/plugins/dbms/firebird/syntax.py
@@ -5,6 +5,7 @@ Copyright (c) 2006-2013 sqlmap developers (http://sqlmap.org/)
 See the file 'doc/COPYING' for copying permission
 """
 
+from lib.core.common import Backend
 from lib.core.common import isDBMSVersionAtLeast
 from plugins.generic.syntax import Syntax as GenericSyntax
 
diff --git a/plugins/dbms/sqlite/syntax.py b/plugins/dbms/sqlite/syntax.py
index abe6610a1..6e9896548 100644
--- a/plugins/dbms/sqlite/syntax.py
+++ b/plugins/dbms/sqlite/syntax.py
@@ -7,6 +7,7 @@ See the file 'doc/COPYING' for copying permission
 
 import binascii
 
+from lib.core.common import Backend
 from lib.core.common import isDBMSVersionAtLeast
 from lib.core.settings import UNICODE_ENCODING
 from plugins.generic.syntax import Syntax as GenericSyntax
diff --git a/tamper/space2mysqlblank.py b/tamper/space2mysqlblank.py
index 891d9226c..f866d6924 100644
--- a/tamper/space2mysqlblank.py
+++ b/tamper/space2mysqlblank.py
@@ -33,7 +33,7 @@ def tamper(payload, **kwargs):
 
     >>> random.seed(0)
     >>> tamper('SELECT id FROM users')
-    'SELECT%A0id%0BFROM%0Cusers'
+    'SELECT%0Bid%0DFROM%0Cusers'
     """
 
     # ASCII table: