diff --git a/fail2ban/tests/sockettestcase.py b/fail2ban/tests/sockettestcase.py
index 4e14ece554..8cd22a419d 100644
--- a/fail2ban/tests/sockettestcase.py
+++ b/fail2ban/tests/sockettestcase.py
@@ -86,7 +86,7 @@ def _createServerThread(self, force=False):
 	def _stopServerThread(self):
 		serverThread = self.serverThread
 		# wait for end of thread :
-		Utils.wait_for(lambda: not serverThread.isAlive() 
+		Utils.wait_for(lambda: not serverThread.is_alive() 
 			or serverThread.join(Utils.DEFAULT_SLEEP_TIME), unittest.F2B.maxWaitTime(10))
 		self.serverThread = None
 
@@ -97,7 +97,7 @@ def testStopPerCloseUnexpected(self):
 		self.server.close()
 		# wait for end of thread :
 		self._stopServerThread()
-		self.assertFalse(serverThread.isAlive())
+		self.assertFalse(serverThread.is_alive())
 		# clean :
 		self.server.stop()
 		self.assertFalse(self.server.isActive())
@@ -138,7 +138,7 @@ def testSocket(self):
 		self.server.stop()
 		# wait for end of thread :
 		self._stopServerThread()
-		self.assertFalse(serverThread.isAlive())
+		self.assertFalse(serverThread.is_alive())
 		self.assertFalse(self.server.isActive())
 		self.assertFalse(os.path.exists(self.sock_name))
 
@@ -179,7 +179,7 @@ def testStopByCommunicate(self):
 		self.server.stop()
 		# wait for end of thread :
 		self._stopServerThread()
-		self.assertFalse(serverThread.isAlive())
+		self.assertFalse(serverThread.is_alive())
 
 	def testLoopErrors(self):
 		# replace poll handler to produce error in loop-cycle:
@@ -215,7 +215,7 @@ def testSocketForce(self):
 		self.server.stop()
 		# wait for end of thread :
 		self._stopServerThread()
-		self.assertFalse(serverThread.isAlive())
+		self.assertFalse(serverThread.is_alive())
 		self.assertFalse(self.server.isActive())
 		self.assertFalse(os.path.exists(self.sock_name))