diff --git a/lib/core/threads.py b/lib/core/threads.py
index 0c5b21b70..55ba2aaff 100644
--- a/lib/core/threads.py
+++ b/lib/core/threads.py
@@ -9,12 +9,14 @@ See the file 'doc/COPYING' for copying permission
 
 import difflib
 import threading
+import time
 
 from lib.core.data import kb
 from lib.core.data import logger
 from lib.core.datatype import advancedDict
 from lib.core.exception import sqlmapThreadException
 from lib.core.settings import MAX_NUMBER_OF_THREADS
+from lib.core.settings import PYVERSION
 
 shared = advancedDict()
 
@@ -98,20 +100,25 @@ def runThreads(numThreads, threadFunction, cleanupFunction=None, forwardExceptio
     # Start the threads
     for numThread in range(numThreads):
         thread = threading.Thread(target=exceptionHandledFunction, name=str(numThread), args=[threadFunction])
+
+        # Reference: http://stackoverflow.com/questions/190010/daemon-threads-explanation
+        if PYVERSION >= "2.6":
+            thread.daemon = True
+        else:
+            thread.setDaemon(True)
+
         thread.start()
         threads.append(thread)
 
     # And wait for them to all finish
     try:
         alive = True
-
         while alive:
             alive = False
-
             for thread in threads:
                 if thread.isAlive():
                     alive = True
-                    thread.join(1)
+                    time.sleep(1)
 
     except KeyboardInterrupt:
         kb.threadContinue = False
diff --git a/lib/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index 47734cb63..7294e9f26 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -43,6 +43,7 @@ from lib.core.settings import INFERENCE_UNKNOWN_CHAR
 from lib.core.settings import INFERENCE_GREATER_CHAR
 from lib.core.settings import INFERENCE_EQUALS_CHAR
 from lib.core.settings import INFERENCE_NOT_EQUALS_CHAR
+from lib.core.settings import PYVERSION
 from lib.core.unescaper import unescaper
 from lib.request.connect import Connect as Request
 
@@ -413,6 +414,12 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
         # Start the threads
         for numThread in range(numThreads):
             thread = threading.Thread(target=downloadThread, name=str(numThread))
+
+            if PYVERSION >= "2.6":
+                thread.daemon = True
+            else:
+                thread.setDaemon(True)
+
             thread.start()
             threads.append(thread)
 
@@ -424,7 +431,8 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                 for thread in threads:
                     if thread.isAlive():
                         alive = True
-                        thread.join(5)
+                        time.sleep(1)
+
         except KeyboardInterrupt:
             kb.threadContinue = False
             raise
diff --git a/sqlmap.py b/sqlmap.py
index e97e59f21..dbc9cbad2 100755
--- a/sqlmap.py
+++ b/sqlmap.py
@@ -129,8 +129,8 @@ def main():
         kb.threadContinue = False
         kb.threadException = True
 
-        # just in case handling of leftover threads
-        raise SystemExit
+        # Reference: http://stackoverflow.com/questions/1635080/terminate-a-multi-thread-python-program
+        os._exit(0)
 
 if __name__ == "__main__":
     main()