diff --git a/lib/core/option.py b/lib/core/option.py
index a498c7ab1..4d12b49ec 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1555,7 +1555,7 @@ def _setKnowledgeBaseAttributes(flushAll=True):
     kb.lastParserStatus = None
 
     kb.locks = AttribDict()
-    for _ in ("cache", "count", "index", "io", "limit", "log", "request", "value"):
+    for _ in ("cache", "count", "index", "io", "limit", "log", "redirect", "request", "value"):
         kb.locks[_] = threading.Lock()
 
     kb.matchRatio = None
diff --git a/lib/request/redirecthandler.py b/lib/request/redirecthandler.py
index 8988e6588..b8e96d2d4 100644
--- a/lib/request/redirecthandler.py
+++ b/lib/request/redirecthandler.py
@@ -38,12 +38,13 @@ class SmartRedirectHandler(urllib2.HTTPRedirectHandler):
         return retVal
 
     def _ask_redirect_choice(self, redcode, redurl):
-        if kb.redirectChoice is None:
-            msg = "sqlmap got a %d redirect to " % redcode
-            msg += "'%s'. Do you want to follow? [Y/n] " % redurl
-            choice = readInput(msg, default="Y")
+        with kb.locks.redirect:
+            if kb.redirectChoice is None:
+                msg = "sqlmap got a %d redirect to " % redcode
+                msg += "'%s'. Do you want to follow? [Y/n] " % redurl
+                choice = readInput(msg, default="Y")
 
-            kb.redirectChoice = choice.upper()
+                kb.redirectChoice = choice.upper()
 
     def http_error_302(self, req, fp, code, msg, headers):
         content = None