diff --git a/logstash/scripts/ja3_build_list.py b/logstash/scripts/ja3_build_list.py
index 28eb422ec..4eea3de00 100755
--- a/logstash/scripts/ja3_build_list.py
+++ b/logstash/scripts/ja3_build_list.py
@@ -72,6 +72,7 @@ def main():
     sys.tracebacklimit = 0
 
   ja3Map = defaultdict(list)
+  fingerprint = None
 
   urls = ['https://ja3er.com/getAllUasJson']
   for url in urls: