diff --git a/scapy/sendrecv.py b/scapy/sendrecv.py
index 479060c9a87..c3cd3bc40da 100644
--- a/scapy/sendrecv.py
+++ b/scapy/sendrecv.py
@@ -1139,6 +1139,10 @@ def __init__(self, *args, **kwargs):
         # type: (*Any, **Any) -> None
         # Store keyword arguments
         self.args = args
+        if "timeout" in kwargs:
+            raise ValueError(
+                "'timeout' isn't supported with AsyncSniffer. Use join(timeout=1)"
+            )
         self.kwargs = kwargs
         self.running = False
         self.thread = None  # type: Optional[Thread]
diff --git a/test/contrib/automotive/ccp.uts b/test/contrib/automotive/ccp.uts
index b267317a580..82bd6532ecb 100644
--- a/test/contrib/automotive/ccp.uts
+++ b/test/contrib/automotive/ccp.uts
@@ -889,7 +889,7 @@ def answer(pkt):
     assert cro.data == b"\x10\x11\x12\x10\x11\x12"
     sock2.send(CCP(b'\x00\x00\x07\x00\x08\x00\x00\x00\xff\x00\x53\x02\x34\x00\x20\x06'))
 
-sniffer = AsyncSniffer(opened_socket=sock2, count=1, timeout=5, prn=answer)
+sniffer = AsyncSniffer(opened_socket=sock2, count=1, prn=answer)
 sniffer.start()
 dto = sock1.sr1(CCP(identifier=0x700)/CRO(ctr=0x53)/PROGRAM_6(data=b"\x10\x11\x12\x10\x11\x12"), timeout=1, verbose=False)
 sniffer.join(timeout=5)
@@ -915,7 +915,7 @@ def answer(pkt):
     assert cro.data == b"\x10\x11\x12\x10\x11\x12"
     sock2.send(CCP(b'\x00\x00\x07\x00\x08\x00\x00\x00\xff\x00\x55\x02\x34\x00\x20\x06'))
 
-sniffer = AsyncSniffer(opened_socket=sock2, count=1, timeout=5, prn=answer)
+sniffer = AsyncSniffer(opened_socket=sock2, count=1, prn=answer)
 sniffer.start()
 dto = sock1.sr1(CCP(identifier=0x700)/CRO(ctr=0x54)/PROGRAM_6(data=b"\x10\x11\x12\x10\x11\x12"), timeout=0.1, verbose=False)
 sniffer.join(timeout=5)
@@ -936,7 +936,7 @@ def answer(pkt):
     assert cro.data == b"\x10\x11\x12\x10\x11\x12"
     sock2.send(CCP(b'\x00\x00\x07\x00\x08\x00\x00\x00\xff\x01\x55\xff\xff\xff\xff\xff'))
 
-sniffer = AsyncSniffer(opened_socket=sock2, count=1, timeout=5, prn=answer)
+sniffer = AsyncSniffer(opened_socket=sock2, count=1, prn=answer)
 sniffer.start()
 dto = sock1.sr1(CCP(identifier=0x700)/CRO(ctr=0x55)/PROGRAM_6(data=b"\x10\x11\x12\x10\x11\x12"), timeout=1, verbose=False)
 sniffer.join(timeout=5)
diff --git a/test/contrib/automotive/testsocket.uts b/test/contrib/automotive/testsocket.uts
index 005daf99d54..c1ad811a126 100644
--- a/test/contrib/automotive/testsocket.uts
+++ b/test/contrib/automotive/testsocket.uts
@@ -40,7 +40,7 @@ def create_answer(p):
     ans = TestPacket(identifier=p.identifier + 1, data=p.data + b"_answer")
     receiver.send(ans)
 
-t = AsyncSniffer(timeout=50, prn=create_answer, opened_socket=receiver)
+t = AsyncSniffer(prn=create_answer, opened_socket=receiver)
 t.start()
 
 pks = PacketList()
@@ -51,7 +51,8 @@ for i in range(1, 2000, 2):
     pks.append(txp)
     pks.append(rxp)
 
-t.stop(join=True)
+t.join(timeout=10)
+t.stop()
 convs = pks.sr()
 
 sender.close()
@@ -69,12 +70,13 @@ sender = TestSocket(TestPacket)
 receiver = TestSocket(TestPacket)
 sender.pair(receiver)
 
-t = AsyncSniffer(timeout=10, prn=create_answer, opened_socket=receiver)
+t = AsyncSniffer(prn=create_answer, opened_socket=receiver)
 t.start()
 
 txp = TestPacket(identifier=range(1, testlen * 2, 2), data=b"test1")
 rxp = sender.sr(txp, timeout=10, verbose=False, prebuild=True)
-t.stop(join=True)
+t.join(timeout=10)
+t.stop()
 
 print(rxp)
 print(rxp[0].summary())
@@ -91,11 +93,12 @@ sender = TestSocket(TestPacket)
 receiver = TestSocket(TestPacket)
 sender.pair(receiver)
 
-t = AsyncSniffer(timeout=10, prn=create_answer, opened_socket=receiver)
+t = AsyncSniffer(prn=create_answer, opened_socket=receiver)
 t.start()
 
 txp = [TestPacket(identifier=i, data=b"hello") for i in range(1, 2000, 2)]
 rxp = sender.sr(txp, timeout=10, verbose=False)
+t.join(timeout=10)
 t.stop(join=True)
 
 print(rxp)
diff --git a/test/contrib/automotive/xcp/xcp_comm.uts b/test/contrib/automotive/xcp/xcp_comm.uts
index 2b933ca49e2..d84b55bc1a5 100644
--- a/test/contrib/automotive/xcp/xcp_comm.uts
+++ b/test/contrib/automotive/xcp/xcp_comm.uts
@@ -21,7 +21,7 @@ sock2 = TestSocket(XCPOnCAN)
 sock1.pair(sock2)
 
 response = XCPOnCAN(identifier=0x700) / CTOResponse() / ConnectPositiveResponse(b'\x15\xC0\x08\x08\x00\x10\x10')
-sniffer = AsyncSniffer(opened_socket=sock2, count=1, timeout=5, prn=lambda x: sock2.send(response))
+sniffer = AsyncSniffer(opened_socket=sock2, count=1, prn=lambda x: sock2.send(response))
 sniffer.start()
 pkt = XCPOnCAN(identifier=0x700) / CTORequest() / Connect()
 ans = sock1.sr1(pkt, timeout=0.5, verbose=False)
diff --git a/test/contrib/isotp_soft_socket.uts b/test/contrib/isotp_soft_socket.uts
index eef5b5e6d67..9cdb6d1f211 100644
--- a/test/contrib/isotp_soft_socket.uts
+++ b/test/contrib/isotp_soft_socket.uts
@@ -890,7 +890,7 @@ cans.pair(isocan)
 
 acker = AsyncSniffer(store=False, opened_socket=cans,
                      prn=lambda x: cans.send(CAN(identifier = 0x241, data=dhex("30 04 00"))),
-                     count=1, timeout=1)
+                     count=1)
 acker.start()
 with ISOTPSoftSocket(isocan, tx_id=0x641, rx_id=0x241) as s:
     s.send(isotp)
@@ -913,7 +913,7 @@ cans.pair(isocan)
 acker = AsyncSniffer(store=False, opened_socket=cans,
                      prn=lambda x: cans.send(
                          CAN(identifier = 0x241, data=dhex("32 00 00"))),
-                     count=1, timeout=1)
+                     count=1)
 acker.start()
 
 with ISOTPSoftSocket(isocan, tx_id=0x641, rx_id=0x241) as s:
@@ -934,7 +934,7 @@ msg = ISOTP(b'\x11\x22\x33\x11\x22\x33\x11\x22\x33\x11\x22\x33')
 with TestSocket(CAN) as isocan_tx, ISOTPSoftSocket(isocan_tx, 0x123, 0x321) as sock_tx, \
     TestSocket(CAN) as isocan_rx, ISOTPSoftSocket(isocan_rx, 0x321, 0x123) as sock_rx:
     isocan_rx.pair(isocan_tx)
-    sniffer = AsyncSniffer(opened_socket=sock_rx, timeout=1, count=1, prn=lambda x: sock_rx.send(msg))
+    sniffer = AsyncSniffer(opened_socket=sock_rx, count=1, prn=lambda x: sock_rx.send(msg))
     sniffer.start()
     rx2 = sock_tx.sr1(msg, timeout=3, verbose=True)
     sniffer.join(timeout=1)
@@ -1374,7 +1374,7 @@ acks.pair(cans)
 def send_ack(x):
     acks.send(CAN(identifier = 0x241, data=dhex("30 00 00")))
 
-acker = AsyncSniffer(opened_socket=acks, store=False, prn=send_ack, timeout=1, count=1)
+acker = AsyncSniffer(opened_socket=acks, store=False, prn=send_ack, count=1)
 acker.start()
 
 with TestSocket(CAN) as isocan, ISOTPSoftSocket(isocan, tx_id=0x641, rx_id=0x241, padding=True) as s:
diff --git a/test/linux.uts b/test/linux.uts
index d651fccee3f..d84e9249b3c 100644
--- a/test/linux.uts
+++ b/test/linux.uts
@@ -393,7 +393,6 @@ with VEthPair("left0", "right0") as veth:
         iface="right0",
         lfilter=lambda p: Dot1Q in p,
         count=2,
-        timeout=5,
         started_callback=_send,
     )
     sniffer.start()