diff --git a/tools/har-to-old.py b/tools/har-to-old.py
index ccf28289bc629895a403714ea382e64efa12d840..e5c2c0298978b33b6d1440595c2867b0faeedd5b 100755
--- a/tools/har-to-old.py
+++ b/tools/har-to-old.py
@@ -70,7 +70,7 @@ def extract(n, destdir):
 
         with open(f'{prefix}-request.txt', 'wb') as fd:
             write_request(entry, fd)
-        with open(f'{prefix}.response.txt', 'w') as fd:
+        with open(f'{prefix}-response.txt', 'w') as fd:
             write_response(entry, fd)
         with open(prefix, 'wb') as fd:
             write_body(entry, fd)