diff --git a/modelx/serialize/serializer_6.py b/modelx/serialize/serializer_6.py
index 599da89..3be4f40 100644
--- a/modelx/serialize/serializer_6.py
+++ b/modelx/serialize/serializer_6.py
@@ -951,7 +951,7 @@ def parse_source(self, path_, obj: Interface):
         srcstructure = SourceStructure(src)
         atok = asttokens.ASTTokens(src, parse=True)
 
-        for i, stmt in enumerate(atok.tree.body):
+        for stmt in atok.tree.body:
             sec = srcstructure.get_section(stmt.lineno)
             parser = ParserSelector.select(stmt, sec, atok)(
                 stmt, atok, self, sec, obj, srcpath=path_