diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index c9b8857d30..23c7674881 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -379,7 +379,7 @@ static void ATExecCheckNotNull(AlteredTableInfo *tab, Relation rel,
 							   const char *colName, LOCKMODE lockmode);
 static bool NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr);
 static bool ConstraintImpliedByRelConstraint(Relation scanrel,
-											 List *partConstraint, List *existedConstraints);
+											 List *testConstraint, List *provenConstraint);
 static ObjectAddress ATExecColumnDefault(Relation rel, const char *colName,
 										 Node *newDefault, LOCKMODE lockmode);
 static ObjectAddress ATExecAddIdentity(Relation rel, const char *colName,