diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index 12302cdbc3d9b..2462a9a6db6a4 100755
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -31,7 +31,7 @@
 from test_framework.util import hex_str_to_bytes, assert_equal
 
 MIN_VERSION_SUPPORTED = 60001
-MY_VERSION = 70014  # past bip-31 for ping/pong
+MY_VERSION = 70016  # past wtxid relay
 MY_SUBVERSION = b"/python-mininode-tester:0.0.3/"
 MY_RELAY = 1 # from version 70001 onwards, fRelay should be appended to version messages (BIP37)
 
@@ -59,6 +59,7 @@
 MSG_BLOCK = 2
 MSG_FILTERED_BLOCK = 3
 MSG_CMPCT_BLOCK = 4
+MSG_WTX = 5
 MSG_WITNESS_FLAG = 1 << 30
 MSG_TYPE_MASK = 0xffffffff >> 2
 
@@ -242,7 +243,8 @@ class CInv:
         MSG_TX | MSG_WITNESS_FLAG: "WitnessTx",
         MSG_BLOCK | MSG_WITNESS_FLAG: "WitnessBlock",
         MSG_FILTERED_BLOCK: "filtered Block",
-        4: "CompactBlock"
+        4: "CompactBlock",
+        5: "WTX",
     }
 
     def __init__(self, t=0, h=0):
@@ -263,6 +265,9 @@ def __repr__(self):
         return "CInv(type=%s hash=%064x)" \
             % (self.typemap[self.type], self.hash)
 
+    def __eq__(self, other):
+        return isinstance(other, CInv) and self.hash == other.hash and self.type == other.type
+
 
 class CBlockLocator:
     __slots__ = ("nVersion", "vHave")
@@ -1124,6 +1129,22 @@ def serialize(self):
     def __repr__(self):
         return "msg_tx(tx=%s)" % (repr(self.tx))
 
+class msg_wtxidrelay:
+    __slots__ = ()
+    msgtype = b"wtxidrelay"
+
+    def __init__(self):
+        pass
+
+    def deserialize(self, f):
+        pass
+
+    def serialize(self):
+        return b""
+
+    def __repr__(self):
+        return "msg_wtxidrelay()"
+
 
 class msg_no_witness_tx(msg_tx):
     __slots__ = ()
diff --git a/test/functional/test_framework/mininode.py b/test/functional/test_framework/mininode.py
index e6da33763d7c5..7d453d101d6f3 100755
--- a/test/functional/test_framework/mininode.py
+++ b/test/functional/test_framework/mininode.py
@@ -59,6 +59,8 @@
     MSG_TYPE_MASK,
     msg_verack,
     msg_version,
+    MSG_WTX,
+    msg_wtxidrelay,
     NODE_NETWORK,
     NODE_WITNESS,
     sha256,
@@ -96,6 +98,7 @@
     b"tx": msg_tx,
     b"verack": msg_verack,
     b"version": msg_version,
+    b"wtxidrelay": msg_wtxidrelay,
 }
 
 MAGIC_BYTES = {
@@ -356,6 +359,7 @@ def on_pong(self, message): pass
     def on_sendcmpct(self, message): pass
     def on_sendheaders(self, message): pass
     def on_tx(self, message): pass
+    def on_wtxidrelay(self, message): pass
 
     def on_inv(self, message):
         want = msg_getdata()
@@ -654,7 +658,7 @@ def on_inv(self, message):
         super().on_inv(message) # Send getdata in response.
         # Store how many times invs have been received for each tx.
         for i in message.inv:
-            if i.type == MSG_TX:
+            if (i.type == MSG_TX) or (i.type == MSG_WTX):
                 # save txid
                 self.tx_invs_received[i.hash] += 1