diff --git a/net/test/anycast_test.py b/net/test/anycast_test.py
old mode 100755
new mode 100644
index 62d874e..6222580
--- a/net/test/anycast_test.py
+++ b/net/test/anycast_test.py
@@ -93,9 +93,14 @@
     # This will hang if the kernel has the bug.
     thread = CloseFileDescriptorThread(self.tuns[netid])
     thread.start()
-    # Wait up to 0.5 seconds for the thread to finish, but
+    # Wait up to 3 seconds for the thread to finish, but
     # continue and fail the test if the thread hangs.
-    thread.join(0.5)
+
+    # For kernels with MPTCP ported, closing tun interface need more
+    # than 0.5 sec. DAD procedure within MPTCP fullmesh module takes
+    # more time, because duplicate address-timer takes a refcount
+    # on the IPv6-address, preventing it from getting closed.
+    thread.join(3)
 
     # Make teardown work.
     del self.tuns[netid]