diff --git a/lib/takeover/udf.py b/lib/takeover/udf.py
index cab963b38..565926514 100644
--- a/lib/takeover/udf.py
+++ b/lib/takeover/udf.py
@@ -11,7 +11,6 @@ from lib.core.agent import agent
 from lib.core.common import dataToStdout
 from lib.core.common import Backend
 from lib.core.common import isStackingAvailable
-from lib.core.common import isTechniqueAvailable
 from lib.core.common import readInput
 from lib.core.data import conf
 from lib.core.data import logger
@@ -20,7 +19,6 @@ from lib.core.enums import DBMS
 from lib.core.enums import CHARSET_TYPE
 from lib.core.enums import EXPECTED
 from lib.core.enums import OS
-from lib.core.enums import PAYLOAD
 from lib.core.common import unArrayizeValue
 from lib.core.exception import SqlmapFilePathException
 from lib.core.exception import SqlmapMissingMandatoryOptionException
diff --git a/plugins/dbms/firebird/syntax.py b/plugins/dbms/firebird/syntax.py
index 695a4598d..c73325df5 100644
--- a/plugins/dbms/firebird/syntax.py
+++ b/plugins/dbms/firebird/syntax.py
@@ -5,7 +5,6 @@ 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 6e9896548..abe6610a1 100644
--- a/plugins/dbms/sqlite/syntax.py
+++ b/plugins/dbms/sqlite/syntax.py
@@ -7,7 +7,6 @@ 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/waf/datapower.py b/waf/datapower.py
index 90947405f..66dde7bb6 100644
--- a/waf/datapower.py
+++ b/waf/datapower.py
@@ -7,7 +7,6 @@ See the file 'doc/COPYING' for copying permission
 
 import re
 
-from lib.core.enums import HTTPHEADER
 from lib.core.settings import WAF_ATTACK_VECTORS
 
 __product__ = "IBM WebSphere DataPower (IBM)"
diff --git a/waf/knownsec.py b/waf/knownsec.py
index 6f3f15b0e..1f963f845 100644
--- a/waf/knownsec.py
+++ b/waf/knownsec.py
@@ -7,7 +7,6 @@ See the file 'doc/COPYING' for copying permission
 
 import re
 
-from lib.core.enums import HTTPHEADER
 from lib.core.settings import WAF_ATTACK_VECTORS
 
 __product__ = "KS-WAF (Knownsec)"