diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 87e2dbaf163..c27829183c8 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -302,6 +302,7 @@ def initialize_datadir(dirname, n):
         f.write("discover=0\n")
         f.write("listenonion=0\n")
         f.write("printtoconsole=0\n")
+        f.write("upnp=0\n")
         os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
         os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
     return datadir