diff --git a/src/lib/dns/tests/testdata/gen-wiredata.py.in b/src/lib/dns/tests/testdata/gen-wiredata.py.in
index 6f181b4e0c..7a82bfdca7 100755
--- a/src/lib/dns/tests/testdata/gen-wiredata.py.in
+++ b/src/lib/dns/tests/testdata/gen-wiredata.py.in
@@ -515,6 +515,7 @@ class TSIG(RR):
 
     # TSIG has some special defaults
     def __init__(self):
+        super().__init__()
         self.rr_class = 'ANY'
         self.rr_ttl = 0