diff --git a/test/functional/wallet-dump.py b/test/functional/wallet-dump.py
index 68452f5cbf..5fa87508f8 100755
--- a/test/functional/wallet-dump.py
+++ b/test/functional/wallet-dump.py
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the dumpwallet RPC."""
+import os
 import sys
 
 from test_framework.test_framework import BitcoinTestFramework