diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -1659,6 +1659,9 @@
     def _testRecvmsgShorter(self):
         self.sendToServer(MSG)
 
+    # FreeBSD < 8 doesn't always set the MSG_TRUNC flag when a truncated
+    # datagram is received (issue #13001).
+    @support.requires_freebsd_version(8)
     def testRecvmsgTrunc(self):
         # Receive part of message, check for truncation indicators.
         msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,
@@ -1668,6 +1671,7 @@
         self.assertEqual(ancdata, [])
         self.checkFlags(flags, eor=False)
 
+    @support.requires_freebsd_version(8)
     def _testRecvmsgTrunc(self):
         self.sendToServer(MSG)