diff --git a/scripts/parse_mld_xml.py b/scripts/parse_mld_xml.py
index bbc47754ca0c87946c271b66ea957e60a9dd9653..34371deabc2e586bb1525a6b7259bbe329c2c51b 100644
--- a/scripts/parse_mld_xml.py
+++ b/scripts/parse_mld_xml.py
@@ -27,7 +27,7 @@ if __name__ == '__main__':
         for testcase in testcases:
             fulltestname = testcase.get('file') + "::" + testcase.get('name')
             system_out = testcase.find(".//system-out")
-            mld_val = 0
+            mld_val = None
             if system_out is not None:
                 for line in system_out.text.split('\n'):
                     if line.startswith('MLD:'):