diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index 9a219dbcab..140063ef8e 100755
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -25,6 +25,7 @@
 import math
 import random
 import socket
+import struct
 import time
 import unittest